0001171843-26-003535 | 10-Q | XBRL Viewer

Print Document

Note 9 - Accounts Payable, Accured Expenses and Other Liabilities - Schedule of Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Legal fees	$ 831	$ 635
Accounts payable and accrued expenses	1,015	814
Accounting and auditing fees	123	103
Accrued interest payable	44	0
Other accounts payable and accrued expenses	61	76
VAT and other tax liabilities	26	87
Total accounts payable and accrued expenses	1,015	814
Sono Motors GmbH [Member]
Liabilities of discontinued operations classified as held for sale, including lease liabilities	$ 1,029	$ 983

- Definition

Amount classified as liabilities attributable to disposal group held for sale or disposed of.

+ References + Details

Note 2 - Basis of Presentation, Consolidation and Summary of Significant Accounting Policies	3 Months Ended
Mar. 31, 2026
Notes to Financial Statements
Basis of Presentation and Significant Accounting Policies [Text Block]	2. Basis of Presentation, Consolidation and Summary of Significant Accounting Policies A summary of the significant accounting policies applied in the presentation of the accompanying consolidated financial statements follows: Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles and the rules and regulations of the SEC applicable to interim financial information. Accordingly, they do not include all information and footnotes required by U.S. GAAP for annual financial statements and should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2025. In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all adjustments necessary for a fair presentation, consisting of normal recurring adjustments and the non-recurring classification, reporting-currency, fair-value, discontinued-operations and financing-related adjustments described in these notes. Results for the three months ended March 31, 2026 are not necessarily indicative of results for the full fiscal year. Certain prior-period amounts have been reclassified to conform to the current-period presentation. These reclassifications did not affect total assets, total liabilities, shareholders’ equity, net income (loss) or net decrease in cash and cash equivalents. Reporting currency and functional currency Effective January 1, 2026, the Company changed its reporting currency from the euro to the U.S. dollar. Management made the change to better align the Company’s financial reporting with its U.S.-dollar denominated financing activities, U.S. capital-markets reporting environment, and the Treasury Strategy following the Company’s strategic transition. The Company has recast all prior-period financial information presented in these condensed consolidated financial statements into U.S. dollars as if the U.S. dollar had been the Company’s reporting currency since the earliest period presented. The change in reporting currency does not by itself change the underlying functional-currency determination for each distinct and separable operation. Effective January 1, 2026, Sono Group N.V. determined that its functional currency is the U.S. dollar. As of March 31, 2026, the Subsidiary continues to have the euro as its functional currency. Assets and liabilities of euro-functional operations are translated into U.S. dollars at period-end exchange rates, and revenues, expenses, gains and losses are translated at transaction-date rates or appropriate weighted-average exchange rates. Translation effects are recognized as a component of accumulated other comprehensive income (loss) within shareholders’ equity. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect reported amounts and disclosures. Significant estimates include going concern, held-for-sale and discontinued-operations classification and measurement, fair value measurements of digital assets and derivative liabilities, valuation of convertible notes and related debt discount, lease accounting assumptions, and income tax valuation allowances. Digital assets and derivative instruments Digital assets consisting principally of Bitcoin are accounted for under ASC 350-60. The Company’s Bitcoin holdings are initially recognized at cost and subsequently measured at fair value in accordance with ASC 820, with changes in fair value recognized in net income each reporting period. Digital assets are presented as a separate line item in the condensed consolidated balance sheet. The Company does not present digital asset fair-value changes, realized digital asset gains or losses, written-call premiums, derivative settlements or related execution fees as revenue from contracts with customers because such activities do not arise from contracts with customers within the scope of ASC 606. Written covered Bitcoin call options are accounted for as freestanding derivative liabilities under ASC 815 unless a specific scope exception applies. Premiums received are consideration for assuming a derivative obligation and are not recorded as revenue. Written-call liabilities are measured at fair value at inception and remeasured at fair value each reporting period, with changes recognized in earnings unless hedge accounting is formally designated and documented. The Company has not designated hedge accounting for the arrangements reflected in these condensed consolidated financial statements. The related economics are presented as digital asset treasury income or loss rather than revenue from contracts with customers. Convertible debt, warrants and fair value measurements The Company accounts for convertible debentures by recognizing the debt host net of unamortized debt discount and separately recognizing embedded conversion features that require bifurcation as derivative liabilities. Embedded conversion derivative liabilities are measured at fair value at inception and at each reporting date, with changes in fair value recognized in earnings. Debt discount is amortized to interest expense over the expected term of the convertible debentures. The Company classifies pre-funded warrants in additional paid-in capital when the instruments meet the applicable equity-classification criteria. Cash proceeds from convertible debentures and pre-funded warrants are presented as financing cash inflows in the statement of cash flows, and equity-classified pre-funded warrant amounts are presented within shareholders’ equity. Fair value measurements are categorized within the fair value hierarchy based on the observability of inputs. Bitcoin is measured using the BTC-USD spot price observed at 23:59:59 UTC on the reporting date from the market in which the Company transacts through Blockchain.com and is classified within Level 1. Written covered Bitcoin call options and embedded conversion derivative liabilities are classified within Level 3 when valuation uses significant unobservable inputs, including volatility, term, conversion or settlement assumptions, and probability-weighted outcomes. Credit risk and concentrations Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash, digital assets, collateral arrangements and contractual rights arising from digital asset derivative activity. The Company maintains cash with financial institutions, holds Bitcoin and related rights through digital asset counterparties and custodial arrangements, and monitors counterparty and concentration risk; however, balances may exceed insured or protected limits and are subject to market, custody, liquidity and counterparty risks. Leases The Company accounts for leases under ASC 842, Leases. Right-of-use assets and lease liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. Because the Company’s leases generally do not provide an implicit rate, the Company uses its incremental borrowing rate based on information available at commencement. Lease expense is recognized on a straight-line basis over the lease term. The Company has elected the short-term lease recognition exemption for leases with terms of twelve months or less. As of March 31, 2026, the Company’s lease balances, including right-of-use assets, relate to the Subsidiary and are included in discontinued operations and the disposal group classified as held for sale. Recently Adopted and Recently Issued Pronouncements Effective January 1, 2025, the Company adopted ASU 2023-08, Intangibles—Goodwill and Other—Crypto Assets (Subtopic 350-60): Accounting for and Disclosure of Crypto Assets. The guidance requires in-scope crypto assets to be measured at fair value, with changes in fair value recognized in net income each reporting period, and requires separate presentation and disclosure of crypto assets. The adoption did not have a material impact on the Company’s consolidated financial statements upon adoption because the Company did not hold material crypto assets at the adoption date. The guidance is applicable to the Company’s Bitcoin holdings acquired in connection with the Company’s digital asset treasury strategy (the “Treasury Strategy”). In November 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. In January 2025, the FASB issued ASU 2025-01 to clarify the effective date of ASU 2024-03. The guidance requires additional note disclosures about specified categories of expenses included in certain expense captions. The guidance is effective for annual reporting periods beginning after December 15, 2026 and interim reporting periods beginning after December 15, 2027, with early adoption permitted. The Company is evaluating the effect of the guidance on its disclosures. The Company has evaluated other recently issued accounting pronouncements and does not expect them to have a material effect on its condensed consolidated financial statements or related disclosures.

Note 2 - Basis of Presentation, Consolidation and Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Basis of Presentation and Significant Accounting Policies [Text Block]

2. Basis of Presentation, Consolidation and Summary of Significant Accounting Policies

A summary of the significant accounting policies applied in the presentation of the accompanying consolidated financial statements follows:

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles and the rules and regulations of the SEC applicable to interim financial information. Accordingly, they do not include all information and footnotes required by U.S. GAAP for annual financial statements and should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2025.

In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all adjustments necessary for a fair presentation, consisting of normal recurring adjustments and the non-recurring classification, reporting-currency, fair-value, discontinued-operations and financing-related adjustments described in these notes. Results for the three months ended March 31, 2026 are not necessarily indicative of results for the full fiscal year.

Certain prior-period amounts have been reclassified to conform to the current-period presentation. These reclassifications did not affect total assets, total liabilities, shareholders’ equity, net income (loss) or net decrease in cash and cash equivalents.

Reporting currency and functional currency

Effective January 1, 2026, the Company changed its reporting currency from the euro to the U.S. dollar. Management made the change to better align the Company’s financial reporting with its U.S.-dollar denominated financing activities, U.S. capital-markets reporting environment, and the Treasury Strategy following the Company’s strategic transition. The Company has recast all prior-period financial information presented in these condensed consolidated financial statements into U.S. dollars as if the U.S. dollar had been the Company’s reporting currency since the earliest period presented. The change in reporting currency does not by itself change the underlying functional-currency determination for each distinct and separable operation.

Effective January 1, 2026, Sono Group N.V. determined that its functional currency is the U.S. dollar. As of March 31, 2026, the Subsidiary continues to have the euro as its functional currency. Assets and liabilities of euro-functional operations are translated into U.S. dollars at period-end exchange rates, and revenues, expenses, gains and losses are translated at transaction-date rates or appropriate weighted-average exchange rates. Translation effects are recognized as a component of accumulated other comprehensive income (loss) within shareholders’ equity.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect reported amounts and disclosures. Significant estimates include going concern, held-for-sale and discontinued-operations classification and measurement, fair value measurements of digital assets and derivative liabilities, valuation of convertible notes and related debt discount, lease accounting assumptions, and income tax valuation allowances.

Digital assets and derivative instruments

Digital assets consisting principally of Bitcoin are accounted for under ASC 350-60. The Company’s Bitcoin holdings are initially recognized at cost and subsequently measured at fair value in accordance with ASC 820, with changes in fair value recognized in net income each reporting period. Digital assets are presented as a separate line item in the condensed consolidated balance sheet. The Company does not present digital asset fair-value changes, realized digital asset gains or losses, written-call premiums, derivative settlements or related execution fees as revenue from contracts with customers because such activities do not arise from contracts with customers within the scope of ASC 606.

Written covered Bitcoin call options are accounted for as freestanding derivative liabilities under ASC 815 unless a specific scope exception applies. Premiums received are consideration for assuming a derivative obligation and are not recorded as revenue. Written-call liabilities are measured at fair value at inception and remeasured at fair value each reporting period, with changes recognized in earnings unless hedge accounting is formally designated and documented. The Company has not designated hedge accounting for the arrangements reflected in these condensed consolidated financial statements. The related economics are presented as digital asset treasury income or loss rather than revenue from contracts with customers.

Convertible debt, warrants and fair value measurements

The Company accounts for convertible debentures by recognizing the debt host net of unamortized debt discount and separately recognizing embedded conversion features that require bifurcation as derivative liabilities. Embedded conversion derivative liabilities are measured at fair value at inception and at each reporting date, with changes in fair value recognized in earnings. Debt discount is amortized to interest expense over the expected term of the convertible debentures.

The Company classifies pre-funded warrants in additional paid-in capital when the instruments meet the applicable equity-classification criteria. Cash proceeds from convertible debentures and pre-funded warrants are presented as financing cash inflows in the statement of cash flows, and equity-classified pre-funded warrant amounts are presented within shareholders’ equity.

Fair value measurements are categorized within the fair value hierarchy based on the observability of inputs. Bitcoin is measured using the BTC-USD spot price observed at 23:59:59 UTC on the reporting date from the market in which the Company transacts through Blockchain.com and is classified within Level 1. Written covered Bitcoin call options and embedded conversion derivative liabilities are classified within Level 3 when valuation uses significant unobservable inputs, including volatility, term, conversion or settlement assumptions, and probability-weighted outcomes.

Credit risk and concentrations

Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash, digital assets, collateral arrangements and contractual rights arising from digital asset derivative activity. The Company maintains cash with financial institutions, holds Bitcoin and related rights through digital asset counterparties and custodial arrangements, and monitors counterparty and concentration risk; however, balances may exceed insured or protected limits and are subject to market, custody, liquidity and counterparty risks.

Leases

The Company accounts for leases under ASC 842, Leases. Right-of-use assets and lease liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. Because the Company’s leases generally do not provide an implicit rate, the Company uses its incremental borrowing rate based on information available at commencement. Lease expense is recognized on a straight-line basis over the lease term. The Company has elected the short-term lease recognition exemption for leases with terms of twelve months or less. As of March 31, 2026, the Company’s lease balances, including right-of-use assets, relate to the Subsidiary and are included in discontinued operations and the disposal group classified as held for sale.

Recently Adopted and Recently Issued Pronouncements

Effective January 1, 2025, the Company adopted ASU 2023-08, Intangibles—Goodwill and Other—Crypto Assets (Subtopic 350-60): Accounting for and Disclosure of Crypto Assets. The guidance requires in-scope crypto assets to be measured at fair value, with changes in fair value recognized in net income each reporting period, and requires separate presentation and disclosure of crypto assets. The adoption did not have a material impact on the Company’s consolidated financial statements upon adoption because the Company did not hold material crypto assets at the adoption date. The guidance is applicable to the Company’s Bitcoin holdings acquired in connection with the Company’s digital asset treasury strategy (the “Treasury Strategy”).

In November 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. In January 2025, the FASB issued ASU 2025-01 to clarify the effective date of ASU 2024-03. The guidance requires additional note disclosures about specified categories of expenses included in certain expense captions. The guidance is effective for annual reporting periods beginning after December 15, 2026 and interim reporting periods beginning after December 15, 2027, with early adoption permitted. The Company is evaluating the effect of the guidance on its disclosures.

The Company has evaluated other recently issued accounting pronouncements and does not expect them to have a material effect on its condensed consolidated financial statements or related disclosures.

Note 1 - Organization and Description of Business	3 Months Ended
Mar. 31, 2026
Notes to Financial Statements
Business Description and Basis of Presentation [Text Block]	1. Organization and Description of Business Sono Group N.V. (“Sono N.V.”) is a public company with limited liability (naamloze vennootschap) incorporated under the laws of the Netherlands. The Company is registered in the business register at the Netherlands Chamber of Commerce (trade register number: 80683568). In November 2021, the Company completed its initial public offering, and its ordinary shares commenced trading on The Nasdaq Global Market on November 17, 2021 under the ticker symbol “SEV”. On February 15, 2024, Nasdaq filed a Form 25 Notification of Delisting with the U.S. Securities and Exchange Commission (the “SEC”) to complete the delisting of the Company’s ordinary shares from Nasdaq. On July 2, 2024, the quoting of the Company’s ordinary shares commenced on OTCQB under the ticker symbol “SEVCF”. On September 4, 2025, the Company received approval to list its ordinary shares on Nasdaq, and the ordinary shares commenced trading on the Nasdaq Capital Market under the ticker symbol “SSM” on September 5, 2025. The business address of Sono N.V. as of the date of this Quarterly Report is 4965 Trinidad Drive, Land O’ Lakes, FL 34639, United States of America. As of March 31, 2026, Sono N.V.’s wholly-owned subsidiaries were (i) Sono Motors GmbH, a German limited liability company (Gesellschaft mit beschränkter Haftung) (the “Subsidiary”), registered in the commercial register (Handelsregister) at the local court (Amtsgericht) of Munich, Germany, under HRB 224131, with registered headquarters at Waldmeisterstraße 93, 80935 Munich, Germany, and (ii) Sono Group S.à r.l., a private limited liability company (société à responsabilité limitée) incorporated under the laws of the Grand Duchy of Luxembourg, having its registered office at 8 Avenue de la Gare, L-1610 Luxembourg, Grand Duchy of Luxembourg, which was funded with €12,000 for purposes of providing share capital and had no operations during the three months ended March 31, 2026. As of March 31, 2026, Sono N.V. was the ultimate parent of the Subsidiary and Sono Group S.à r.l. Subsequent to March 31, 2026, Sono N.V. sold the Subsidiary pursuant to a Share Purchase and Transfer Agreement, dated May 4, 2026 (the “SPA”), as a result of which Sono N.V. ceased to be the ultimate parent of the Subsidiary on May 4, 2026. Hereinafter, unless otherwise indicated or the context otherwise requires, the terms “Sono Group”, “Sono”, “the Company”, “we”, “our”, “us” or similar terms, refer to Sono N.V. together with its consolidated subsidiaries as of March 31, 2026. Sono Group historically intended to develop and manufacture electric vehicles with integrated solar panels (the “Sion passenger car program”) and to license its solar technology to other Original Equipment Manufacturers (“OEMs”). On February 24, 2023, the Company announced the decision to terminate the Sion passenger car program and to pivot the business model to exclusively retrofitting and integrating Sono Group’s solar technology onto third party vehicles due to lack of available funding. As a consequence, management determined to apply for the opening of self-administration proceedings with respect to Sono N.V. and the Subsidiary (the “Self-Administration Proceedings”) on May 15, 2023. The Subsidiary withdrew its application for Preliminary Self-Administration Proceedings on January 31, 2024, and the Subsidiary exited its Self-Administration Proceedings on February 29, 2024. The Company reconsolidated the Subsidiary effective March 1, 2024 following its exit from the Self-Administration Proceedings. On March 14, 2026, the Company’s supervisory board resolved to terminate all current and future funding commitments to the Subsidiary and to exit the legacy solar operations conducted through the Subsidiary, with immediate effect. On the same date, the Company’s management board, with the approval of the supervisory board, adopted a digital asset treasury strategy (the “Treasury Strategy”). Under the Treasury Strategy, the principal holding in the Company’s treasury reserve on its balance sheet is allocated to digital assets, principally Bitcoin(“Bitcoin” or “BTC”), by applying a covered-call yield strategy. In connection with the Treasury Strategy, on March 10, 2026, the Company entered into a 2002 ISDA Master Agreement, a related Schedule and a Credit Support Annex with Blockchain.com (BVI) II Limited (“Blockchain.com”), facilitating the Company to enter into derivative and/or hedging transactions to manage the risk associated with the Treasury Strategy. As of March 31, 2026, management concluded that the Subsidiary met the criteria to be classified as held for sale and that the planned disposition (which was completed subsequent to quarter end on May 4, 2026, as further described under Note 16 (Subsequent Events)) represents a strategic shift that has had, or will have, a major effect on the Company’s operations and financial results. Accordingly, the results of operations of the Subsidiary have been presented as discontinued operations, and the related assets and liabilities have been presented as assets and liabilities of discontinued operations classified as held for sale, for all periods presented. Subsequent to March 31, 2026, on May 4, 2026, the Company sold and transferred 100% of the outstanding share capital of the Subsidiary to third-party purchasers. See Note 3 (Liquidity and Going Concern Analysis), Note 4 (Discontinued Operations and Assets and Liabilities Held for Sale), Note 5 (Digital Assets), Note 6 (Written Covered Bitcoin Call Options), Note 8 (Convertible Notes, Embedded Derivatives and Pre-Funded Warrants) and Note 16 (Subsequent Events) for additional information. These unaudited condensed consolidated financial statements reflect all adjustments, including normal recurring adjustments, which, in the opinion of management, are necessary to present fairly the financial position, results of operations and cash flows for the periods presented in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). On a consolidated basis, the Company’s operations during the three months ended March 31, 2026 and the three months ended March 31, 2025 are comprised of the parent company, Sono N.V., and the Subsidiary. All significant intercompany transactions and balances have been eliminated upon consolidation. Certain amounts in the prior period unaudited condensed consolidated financial statements have been reclassified to conform to the current period presentation, including the presentation of the Subsidiary as a discontinued operation. In addition, effective January 1, 2026, the Company changed its reporting currency from the euro to the U.S. dollar, and all prior-period financial information presented in these unaudited condensed consolidated financial statements has been recast into U.S. dollars as if the U.S. dollar had been the Company’s reporting currency since the earliest period presented. See Note 2 (Basis of Presentation, Consolidation and Summary of Significant Accounting Policies) for additional information regarding the change in reporting currency.

Note 1 - Organization and Description of Business

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Business Description and Basis of Presentation [Text Block]

1. Organization and Description of Business

Sono Group N.V. (“Sono N.V.”) is a public company with limited liability (naamloze vennootschap) incorporated under the laws of the Netherlands. The Company is registered in the business register at the Netherlands Chamber of Commerce (trade register number: 80683568).

In November 2021, the Company completed its initial public offering, and its ordinary shares commenced trading on The Nasdaq Global Market on November 17, 2021 under the ticker symbol “SEV”. On February 15, 2024, Nasdaq filed a Form 25 Notification of Delisting with the U.S. Securities and Exchange Commission (the “SEC”) to complete the delisting of the Company’s ordinary shares from Nasdaq. On July 2, 2024, the quoting of the Company’s ordinary shares commenced on OTCQB under the ticker symbol “SEVCF”. On September 4, 2025, the Company received approval to list its ordinary shares on Nasdaq, and the ordinary shares commenced trading on the Nasdaq Capital Market under the ticker symbol “SSM” on September 5, 2025.

The business address of Sono N.V. as of the date of this Quarterly Report is 4965 Trinidad Drive, Land O’ Lakes, FL 34639, United States of America. As of March 31, 2026, Sono N.V.’s wholly-owned subsidiaries were (i) Sono Motors GmbH, a German limited liability company (Gesellschaft mit beschränkter Haftung) (the “Subsidiary”), registered in the commercial register (Handelsregister) at the local court (Amtsgericht) of Munich, Germany, under HRB 224131, with registered headquarters at Waldmeisterstraße 93, 80935 Munich, Germany, and (ii) Sono Group S.à r.l., a private limited liability company (société à responsabilité limitée) incorporated under the laws of the Grand Duchy of Luxembourg, having its registered office at 8 Avenue de la Gare, L-1610 Luxembourg, Grand Duchy of Luxembourg, which was funded with €12,000 for purposes of providing share capital and had no operations during the three months ended March 31, 2026. As of March 31, 2026, Sono N.V. was the ultimate parent of the Subsidiary and Sono Group S.à r.l. Subsequent to March 31, 2026, Sono N.V. sold the Subsidiary pursuant to a Share Purchase and Transfer Agreement, dated May 4, 2026 (the “SPA”), as a result of which Sono N.V. ceased to be the ultimate parent of the Subsidiary on May 4, 2026. Hereinafter, unless otherwise indicated or the context otherwise requires, the terms “Sono Group”, “Sono”, “the Company”, “we”, “our”, “us” or similar terms, refer to Sono N.V. together with its consolidated subsidiaries as of March 31, 2026.

Sono Group historically intended to develop and manufacture electric vehicles with integrated solar panels (the “Sion passenger car program”) and to license its solar technology to other Original Equipment Manufacturers (“OEMs”). On February 24, 2023, the Company announced the decision to terminate the Sion passenger car program and to pivot the business model to exclusively retrofitting and integrating Sono Group’s solar technology onto third party vehicles due to lack of available funding. As a consequence, management determined to apply for the opening of self-administration proceedings with respect to Sono N.V. and the Subsidiary (the “Self-Administration Proceedings”) on May 15, 2023. The Subsidiary withdrew its application for Preliminary Self-Administration Proceedings on January 31, 2024, and the Subsidiary exited its Self-Administration Proceedings on February 29, 2024. The Company reconsolidated the Subsidiary effective March 1, 2024 following its exit from the Self-Administration Proceedings.

On March 14, 2026, the Company’s supervisory board resolved to terminate all current and future funding commitments to the Subsidiary and to exit the legacy solar operations conducted through the Subsidiary, with immediate effect. On the same date, the Company’s management board, with the approval of the supervisory board, adopted a digital asset treasury strategy (the “Treasury Strategy”). Under the Treasury Strategy, the principal holding in the Company’s treasury reserve on its balance sheet is allocated to digital assets, principally Bitcoin(“Bitcoin” or “BTC”), by applying a covered-call yield strategy. In connection with the Treasury Strategy, on March 10, 2026, the Company entered into a 2002 ISDA Master Agreement, a related Schedule and a Credit Support Annex with Blockchain.com (BVI) II Limited (“Blockchain.com”), facilitating the Company to enter into derivative and/or hedging transactions to manage the risk associated with the Treasury Strategy.

As of March 31, 2026, management concluded that the Subsidiary met the criteria to be classified as held for sale and that the planned disposition (which was completed subsequent to quarter end on May 4, 2026, as further described under Note 16 (Subsequent Events)) represents a strategic shift that has had, or will have, a major effect on the Company’s operations and financial results. Accordingly, the results of operations of the Subsidiary have been presented as discontinued operations, and the related assets and liabilities have been presented as assets and liabilities of discontinued operations classified as held for sale, for all periods presented. Subsequent to March 31, 2026, on May 4, 2026, the Company sold and transferred 100% of the outstanding share capital of the Subsidiary to third-party purchasers. See Note 3 (Liquidity and Going Concern Analysis), Note 4 (Discontinued Operations and Assets and Liabilities Held for Sale), Note 5 (Digital Assets), Note 6 (Written Covered Bitcoin Call Options), Note 8 (Convertible Notes, Embedded Derivatives and Pre-Funded Warrants) and Note 16 (Subsequent Events) for additional information.

These unaudited condensed consolidated financial statements reflect all adjustments, including normal recurring adjustments, which, in the opinion of management, are necessary to present fairly the financial position, results of operations and cash flows for the periods presented in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”).

On a consolidated basis, the Company’s operations during the three months ended March 31, 2026 and the three months ended March 31, 2025 are comprised of the parent company, Sono N.V., and the Subsidiary. All significant intercompany transactions and balances have been eliminated upon consolidation. Certain amounts in the prior period unaudited condensed consolidated financial statements have been reclassified to conform to the current period presentation, including the presentation of the Subsidiary as a discontinued operation. In addition, effective January 1, 2026, the Company changed its reporting currency from the euro to the U.S. dollar, and all prior-period financial information presented in these unaudited condensed consolidated financial statements has been recast into U.S. dollars as if the U.S. dollar had been the Company’s reporting currency since the earliest period presented. See Note 2 (Basis of Presentation, Consolidation and Summary of Significant Accounting Policies) for additional information regarding the change in reporting currency.

Note 10 - Leases (Details Textual)	Mar. 31, 2026	Dec. 31, 2025
Operating Lease, Weighted Average Remaining Lease Term	122 months	122 months
Operating Lease, Weighted Average Discount Rate, Percent	18.00%	18.00%

Note 7 - Fair Value Measurements

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Fair Value Disclosures [Text Block]

7. Fair Value Measurements

The Company measures Bitcoin and derivative liabilities at fair value in accordance with ASC 820. For directly held Bitcoin, management identified the market in which the Company transacts through Blockchain.com as the principal market for the Company’s Bitcoin treasury transactions. Because Bitcoin trades continuously and does not have a single exchange closing time, the Company measures its period-end Bitcoin position using the BTC-USD spot price observed from that principal market at 23:59:59 UTC on the reporting date. For March 31, 2026, the spot price used was $68,233.31 per BTC. Bitcoin is classified as Level 1 because the valuation uses an observable quoted price in an active market. Written covered-call derivative liabilities and embedded conversion derivative liabilities are classified as Level 3 because valuation includes significant unobservable inputs. The Company had no assets or liabilities measured at fair value on a recurring basis at December 31, 2025. The fair value hierarchy and Level 3 rollforward below present the same March 31, 2026 embedded conversion derivative liability balance as the balance sheet caption for derivative liabilities — embedded conversion features and the convertible debt table in Note 8. (Convertible Notes, Embedded Derivatives and Pre-Funded Warrants).

Fair value hierarchy by instrument (USD in thousands)	March 31, 2026 total fair value		Level 1		Level 2		Level 3
Bitcoin digital assets		4,709		4,709		—		—
Embedded conversion derivative liability		3,708		—		—		3,708
Written covered Bitcoin call derivative liability		21		—		—		21

Level 3 derivative liability rollforward (USD in thousands)	Embedded conversion derivative liability			Written covered Bitcoin call derivative liability
Beginning balance, January 1, 2026		—			—
Initial recognition / issuances		5,383			35
Change in fair value recognized in earnings, net		(1,675	)		21
Settlements / expirations / conversions		—			(35	)
Transfers into or out of Level 3		—			—
Ending balance, March 31, 2026		3,708			21

The debt-host allocation / day-one noncash issuance-date adjustment represents the noncash issuance-date allocation effect recognized in connection with bifurcating the embedded conversion derivative liabilities from the convertible-debt host.

Instrument	Fair value hierarchy	Valuation technique / significant inputs
Bitcoin	Level 1	BTC-USD spot price observed from the market in which the Company transacts through Blockchain.com at 23:59:59 UTC on March 31, 2026; spot price used was $68,233.31 per BTC.
Written covered Bitcoin call options	Level 3	Open April 3, 2026 written call; liability equals 0.31053491 BTC x $68,233.31, rounded to $21 thousand. Remaining term at 3/31/26 was three days.
Embedded conversion derivative liabilities	Level 3	Monte Carlo simulation for convertible-debenture embedded conversion features using SSM stock price $6.33, expected volatility 110.0%, risk-free rate 4.25%, expected term 0.85 years, conversion/floor terms and probability-weighted settlement assumptions.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 107
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-107

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 940
-SubTopic 820
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478119/940-820-50-1

+ Details

Significant Accounting Policies (Policies)	3 Months Ended
Significant Accounting Policies (Policies)	Mar. 31, 2026
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles and the rules and regulations of the SEC applicable to interim financial information. Accordingly, they do not include all information and footnotes required by U.S. GAAP for annual financial statements and should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2025. In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all adjustments necessary for a fair presentation, consisting of normal recurring adjustments and the non-recurring classification, reporting-currency, fair-value, discontinued-operations and financing-related adjustments described in these notes. Results for the three months ended March 31, 2026 are not necessarily indicative of results for the full fiscal year.
Reclassification, Comparability Adjustment [Policy Text Block]	Certain prior-period amounts have been reclassified to conform to the current-period presentation. These reclassifications did not affect total assets, total liabilities, shareholders’ equity, net income (loss) or net decrease in cash and cash equivalents.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Reporting currency and functional currency Effective January 1, 2026, the Company changed its reporting currency from the euro to the U.S. dollar. Management made the change to better align the Company’s financial reporting with its U.S.-dollar denominated financing activities, U.S. capital-markets reporting environment, and the Treasury Strategy following the Company’s strategic transition. The Company has recast all prior-period financial information presented in these condensed consolidated financial statements into U.S. dollars as if the U.S. dollar had been the Company’s reporting currency since the earliest period presented. The change in reporting currency does not by itself change the underlying functional-currency determination for each distinct and separable operation. Effective January 1, 2026, Sono Group N.V. determined that its functional currency is the U.S. dollar. As of March 31, 2026, the Subsidiary continues to have the euro as its functional currency. Assets and liabilities of euro-functional operations are translated into U.S. dollars at period-end exchange rates, and revenues, expenses, gains and losses are translated at transaction-date rates or appropriate weighted-average exchange rates. Translation effects are recognized as a component of accumulated other comprehensive income (loss) within shareholders’ equity.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect reported amounts and disclosures. Significant estimates include going concern, held-for-sale and discontinued-operations classification and measurement, fair value measurements of digital assets and derivative liabilities, valuation of convertible notes and related debt discount, lease accounting assumptions, and income tax valuation allowances.
Digital Assets and Derivative Instruments [Policy Text Block]	Digital assets and derivative instruments Digital assets consisting principally of Bitcoin are accounted for under ASC 350-60. The Company’s Bitcoin holdings are initially recognized at cost and subsequently measured at fair value in accordance with ASC 820, with changes in fair value recognized in net income each reporting period. Digital assets are presented as a separate line item in the condensed consolidated balance sheet. The Company does not present digital asset fair-value changes, realized digital asset gains or losses, written-call premiums, derivative settlements or related execution fees as revenue from contracts with customers because such activities do not arise from contracts with customers within the scope of ASC 606. Written covered Bitcoin call options are accounted for as freestanding derivative liabilities under ASC 815 unless a specific scope exception applies. Premiums received are consideration for assuming a derivative obligation and are not recorded as revenue. Written-call liabilities are measured at fair value at inception and remeasured at fair value each reporting period, with changes recognized in earnings unless hedge accounting is formally designated and documented. The Company has not designated hedge accounting for the arrangements reflected in these condensed consolidated financial statements. The related economics are presented as digital asset treasury income or loss rather than revenue from contracts with customers.
Fair Value Measurement, Policy [Policy Text Block]	Convertible debt, warrants and fair value measurements The Company accounts for convertible debentures by recognizing the debt host net of unamortized debt discount and separately recognizing embedded conversion features that require bifurcation as derivative liabilities. Embedded conversion derivative liabilities are measured at fair value at inception and at each reporting date, with changes in fair value recognized in earnings. Debt discount is amortized to interest expense over the expected term of the convertible debentures. The Company classifies pre-funded warrants in additional paid-in capital when the instruments meet the applicable equity-classification criteria. Cash proceeds from convertible debentures and pre-funded warrants are presented as financing cash inflows in the statement of cash flows, and equity-classified pre-funded warrant amounts are presented within shareholders’ equity. Fair value measurements are categorized within the fair value hierarchy based on the observability of inputs. Bitcoin is measured using the BTC-USD spot price observed at 23:59:59 UTC on the reporting date from the market in which the Company transacts through Blockchain.com and is classified within Level 1. Written covered Bitcoin call options and embedded conversion derivative liabilities are classified within Level 3 when valuation uses significant unobservable inputs, including volatility, term, conversion or settlement assumptions, and probability-weighted outcomes.
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Credit risk and concentrations Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash, digital assets, collateral arrangements and contractual rights arising from digital asset derivative activity. The Company maintains cash with financial institutions, holds Bitcoin and related rights through digital asset counterparties and custodial arrangements, and monitors counterparty and concentration risk; however, balances may exceed insured or protected limits and are subject to market, custody, liquidity and counterparty risks.
Lessee, Leases [Policy Text Block]	Leases The Company accounts for leases under ASC 842, Leases. Right-of-use assets and lease liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. Because the Company’s leases generally do not provide an implicit rate, the Company uses its incremental borrowing rate based on information available at commencement. Lease expense is recognized on a straight-line basis over the lease term. The Company has elected the short-term lease recognition exemption for leases with terms of twelve months or less. As of March 31, 2026, the Company’s lease balances, including right-of-use assets, relate to the Subsidiary and are included in discontinued operations and the disposal group classified as held for sale.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted and Recently Issued Pronouncements Effective January 1, 2025, the Company adopted ASU 2023-08, Intangibles—Goodwill and Other—Crypto Assets (Subtopic 350-60): Accounting for and Disclosure of Crypto Assets. The guidance requires in-scope crypto assets to be measured at fair value, with changes in fair value recognized in net income each reporting period, and requires separate presentation and disclosure of crypto assets. The adoption did not have a material impact on the Company’s consolidated financial statements upon adoption because the Company did not hold material crypto assets at the adoption date. The guidance is applicable to the Company’s Bitcoin holdings acquired in connection with the Company’s digital asset treasury strategy (the “Treasury Strategy”). In November 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. In January 2025, the FASB issued ASU 2025-01 to clarify the effective date of ASU 2024-03. The guidance requires additional note disclosures about specified categories of expenses included in certain expense captions. The guidance is effective for annual reporting periods beginning after December 15, 2026 and interim reporting periods beginning after December 15, 2027, with early adoption permitted. The Company is evaluating the effect of the guidance on its disclosures. The Company has evaluated other recently issued accounting pronouncements and does not expect them to have a material effect on its condensed consolidated financial statements or related disclosures.

Note 8 - Convertible Notes, Embedded Derivatives and Pre-Funded Warrants (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Convertible Debt [Table Text Block]

Convertible debenture terms	January Debenture		February Debenture		March Debenture
Issue date	Jan. 26, 2026		Feb. 19, 2026		Mar. 10, 2026
Principal amount	$	600,000	$	750,000	$	3,000,000
Maturity	Jan. 26, 2027		Feb. 19, 2027		Mar. 10, 2027
Interest rate	12%; 18% upon event of default		12%; 18% upon event of default		12%; 18% upon event of default
Fixed conversion price	$	18.75	$	18.75	$	18.75
Variable conversion price	85% of lowest daily VWAP over seven trading days, subject to floor		85% of lowest daily VWAP over seven trading days, subject to floor		85% of lowest daily VWAP over seven trading days, subject to floor
Floor price	$	1.42	$	1.45	$	1.39

Schedule of Debt [Table Text Block]

Convertible debt, warrant and related financial statement presentation reconciliation (USD in thousands)	Amount, KUSD
Balance Sheet – March 31, 2026
Gross convertible notes payable		4,350
Unamortized debt discount		(3,651	)
Convertible notes payable, net of discount		699
Embedded conversion derivative liability		3,708
Accrued interest payable		44
Pre-funded warrant APIC (equity)		1,420
Income Statement –Months Ended March 31, 2026
Day-one loss on derivative liability		(1,083	)
Gain on change in fair value of embedded derivatives		591
Coupon interest expense		(44	)
Debt discount amortization expense		(62	)
Total interest expense		113

Note 7 - Fair Value Measurements - Schedule of Instruments at Fair Value (Details) - USD ($)	Mar. 31, 2026	Dec. 31, 2025
Call Option [Member]
Ending written-call derivative liability	$ 21,000
Fair Value, Recurring [Member] \| Embedded Conversion Features [Member]
Ending written-call derivative liability	3,708,000
Fair Value, Recurring [Member] \| Call Option [Member]
Ending written-call derivative liability	21,000
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Embedded Conversion Features [Member]
Ending written-call derivative liability	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Call Option [Member]
Ending written-call derivative liability	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Embedded Conversion Features [Member]
Ending written-call derivative liability	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Call Option [Member]
Ending written-call derivative liability	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Embedded Conversion Features [Member]
Ending written-call derivative liability	3,708,000
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Call Option [Member]
Ending written-call derivative liability	21,000
Bitcoin [Member]
Bitcoin digital assets	4,709	$ 0
Bitcoin [Member] \| Fair Value, Recurring [Member]
Bitcoin digital assets	4,709,000
Bitcoin [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Bitcoin digital assets	4,709,000
Bitcoin [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Bitcoin digital assets	0
Bitcoin [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Bitcoin digital assets	$ 0

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-22

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-7A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-21

Reference 10: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-20

Reference 11: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-15

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-10

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483466/210-20-50-3

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-6

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-6

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-6

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-6

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-1

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-1

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-1

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-1

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-6

Reference 26: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-6

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(9)(e))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5C
-Subparagraph (SX 210.12-13C(Column H)(Footnote 7))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5C

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(9)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1

Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(9)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1

Reference 31: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SX 210.12-13(Column G)(Footnote 8))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5

Reference 32: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5C
-Subparagraph (SX 210.12-13C(Column H))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5C

Reference 33: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SX 210.12-13(Column G))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5

Reference 34: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5A
-Subparagraph (SX 210.12-13A(Column E))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5A

Reference 35: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5B
-Subparagraph (SX 210.12-13B(Column E))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5B

Reference 36: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5B
-Subparagraph (SX 210.12-13B(Column E)(Footnote 4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5B

+ Details

Note 3 - Liquidity and Going Concern Analysis (Details Textual) - USD ($)		1 Months Ended	3 Months Ended		15 Months Ended
	Apr. 28, 2026	Mar. 31, 2026	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Dec. 31, 2025
Cash and Cash Equivalent		$ 237,000	$ 237,000		$ 237,000	$ 243,000
Retained Earnings (Accumulated Deficit)		(335,405,000)	(335,405,000)		(335,405,000)	$ (333,390,000)
Crypto Asset, Fair Value, Current		4,709,000	4,709,000		4,709,000
Debt Instrument, Face Amount		4,350,000	4,350,000		4,350,000
Convertible Debt		1,129,000	1,129,000		1,129,000
Operating Income (Loss)			(1,480,000)	$ (1,018,000)
Net Income (Loss) Attributable to Parent			(2,015,000)	7,802,000	7,802,000
Proceeds from Convertible Debt			4,350,000	2,000,000
Proceeds from Issuance of Warrants		2,000,000	2,000,000	$ 0
Q1 2026 Debentures [Member]
Debt Instrument, Face Amount		4,350,000	4,350,000		4,350,000
Proceeds from Convertible Debt			6,400,000
April 2026 Debenture [Member] \| Subsequent Event [Member]
Debt Instrument, Face Amount	$ 700,000
Proceeds from Convertible Debt	$ 700,000
Embedded Conversion Features [Member]
Derivative Liability, Current		$ 3,708,000	$ 3,708,000		$ 3,708,000

Note 6 - Written Covered Bitcoin Call Options (Details Textual)	Mar. 31, 2026 USD ($)	Dec. 31, 2025
Call Option [Member]
Derivative Liability, Current	$ 21,000
Bitcoin of Written Premiums [Member]
Crypto Asset, Number of Units	0.51462318
Bitcoin [Member]
Crypto Asset, Number of Units	69.01	0
Crypto Asset, Spot Price	$ 68,233
Bitcoin [Member] \| Call Option [Member]
Crypto Asset, Number of Units	0.31053491
Crypto Asset, Spot Price	$ 68,233

Note 4 - Discontinued Operations and Assets and Liabilities Held for Sale - Schedule of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
Cash and cash equivalents presented in continuing current assets	$ 237	$ 865	$ 243	$ 1,462
Cash of discontinued operations included in assets classified as held for sale	223		53
Valuation allowance / impairment recognized on classification as held for sale	(519)	0
Total cash and cash equivalents including discontinued operations cash	460		296
Cash of discontinued operations, beginning of period	53
Cash of discontinued operations, end of period	223		53
Loss from discontinued operations, net of tax	(1,013)	(1,498)
Sono Motors GmbH [Member]
Disposal Group, Including Discontinued Operation, Right-of-Use Assets	924		673
Lease liabilities	652		673
Revenue	174	31
Net cash provided by (used in) operating activities of discontinued operations	170	(806)
Other disposal-group assets	621		496
Other disposal-group liabilities	377		310
Cost of revenue / cost of sales	(128)	(24)
Effect of exchange-rate changes on cash of discontinued operations	0	(21)
Cash of discontinued operations included in assets classified as held for sale	223	530	53	$ 1,357
Valuation allowance / impairment recognized on classification as held for sale	(519)	0	0
Total liabilities of discontinued operation classified as held for sale	1,029		983
Gross profit	46	7
Net increase (decrease) in cash of discontinued operations	170	(827)
Total assets of discontinued operations classified as held for sale	1,026		1,169
Selling and distribution expenses	(113)	(271)
Cash of discontinued operations, beginning of period	53	1,357	1,357
General and administrative expenses	(242)	(706)
Cash of discontinued operations, end of period	223	530	$ 53
Research and development expenses	(258)	(529)
Depreciation and amortization included in discontinued operations	9	8
Other operating income, net and rounding	77	1
Loss from operations of discontinued operations	(490)	(1,498)
Foreign currency loss, net	(4)	0
Loss from discontinued operations before income taxes	(1,013)	(1,498)
Income tax expense	0	0
Loss from discontinued operations, net of tax	$ (1,013)	$ (1,498)

Note 4 - Discontinued Operations and Assets and Liabilities Held for Sale (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Impairment of Discontinued Operations	$ 519	$ 0
Sono Motors GmbH [Member]
Impairment of Discontinued Operations	519	$ (0)	$ (0)
Disposal Group, Including Discontinued Operation, Right-of-Use Assets	$ 924		$ 673

Note 3 - Liquidity and Going Concern Analysis

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Substantial Doubt about Going Concern [Text Block]

3. Liquidity and Going Concern Analysis

The Company is required to evaluate whether there is substantial doubt about its ability to continue as a going concern each reporting period, including interim periods. In evaluating the Company’s ability to continue as a going concern, management considered the conditions and events that could raise substantial doubt about the Company’s ability to continue as a going concern within twelve months after the date these unaudited condensed consolidated financial statements are issued, in accordance with ASC 205-40. Management considered the Company’s current financial condition and liquidity sources, including current funds available, forecasted future cash flows, and the Company’s obligations due within twelve months after the issuance date of these unaudited condensed consolidated financial statements.

As of March 31, 2026, the Company had cash and cash equivalents of $237 thousand, an accumulated deficit of $335.4 million, $4,709 thousand of Bitcoin measured at fair value, $4,350 thousand of convertible debenture principal outstanding, $1,129 thousand of convertible notes payable, net of discount, and $3,708 thousand of embedded conversion derivative liabilities. For the three months ended March 31, 2026, the Company recognized a loss from operations of $1,480 thousand and a net loss of $2,015 thousand. The Company has incurred recurring operating losses and historically negative cash flows from operations since inception, primarily attributable to the Subsidiary. These conditions raise substantial doubt about the Company’s ability to continue as a going concern.

During the three months ended March 31, 2026, management completed financing transactions and strategic actions related to the Company’s transition to the Treasury Strategy and its exit from legacy solar operations. The Company raised aggregate gross proceeds of approximately $6.4 million through the issuance of three secured convertible debentures to Yorkville on January 26, 2026, February 19, 2026 and March 10, 2026, respectively, in the aggregate principal amount of $4.35 million (the “Q1 2026 Debentures”) and the issuance to Yorkville on March 10, 2026 of a pre-funded warrant for aggregate proceeds of $2.0 million. A substantial portion of these proceeds was used to implement the Treasury Strategy, including the acquisition of Bitcoin and the establishment of the Company’s institutional framework with Blockchain.com under the ISDA Master Agreement and the related Schedule and Credit Support Annex. Management also terminated all current and future funding commitments to the Subsidiary and initiated the Company’s exit from the legacy solar operations conducted through the Subsidiary, which is expected to materially reduce the Company’s ongoing cash outflows. In addition, as further described under Note 16 (Subsequent Events), subsequent to March 31, 2026, the Company completed its exit from the legacy solar operations through the execution and consummation of the SPA pursuant to which the Subsidiary was sold on May 4, 2026, and received an additional tranche of funding from Yorkville in the form of a convertible debenture issued by the Company to Yorkville in the aggregate principal amount of $700 thousand. These actions are relevant to management’s liquidity plans but did not alleviate substantial doubt about the Company’s ability to continue as a going concern.

Management considered the financing transactions, implementation of the Treasury Strategy and exit from legacy solar operations in its liquidity analysis. Although these actions may reduce certain cash outflows and provide additional potential liquidity sources, the Company continues to depend on monetization of digital asset holdings, performance of the Treasury Strategy and availability of external financing, and management did not conclude that substantial doubt was alleviated.

The Company’s ability to maintain adequate liquidity remains subject to significant uncertainties, including the price volatility and liquidity characteristics of digital assets, the terms and potential collateral requirements of transactions entered into in connection with the Treasury Strategy pursuant to the Credit Support Annex described in Note 5 (Digital Assets) and Note 6 (Written Covered Bitcoin Call Options), and the maturities of the convertible debentures issued during the three months ended March 31, 2026, which mature in 2027 and may require refinancing or conversion prior to or at maturity. Based upon this uncertainty, management has concluded that there is substantial doubt that the Company will continue as a going concern. See Note 16 (Subsequent Events) for additional information regarding subsequent events relevant to the matters described above.

- Definition

The entire disclosure when substantial doubt is raised about the ability to continue as a going concern. Includes, but is not limited to, principal conditions or events that raised substantial doubt about the ability to continue as a going concern, management's evaluation of the significance of those conditions or events in relation to the ability to meet its obligations, and management's plans that alleviated or are intended to mitigate the conditions or events that raise substantial doubt about the ability to continue as a going concern.

+ References + Details

Note 10 - Leases (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Lease, Cost [Table Text Block]

Lease-related amounts and inputs included in HFS presentation (USD in thousands, except months and percentages)	March 31, 2026			December 31, 2025
Right-of-use assets included in held-for-sale assets		924			673
Lease liabilities and included in held-for-sale liabilities		652			673
Weighted-average lease term used in measurement (months)		122			122
Weighted-average discount rate		18	%		18	%

Note 6 - Written Covered Bitcoin Call Options - Schedule of Written Covered-call Derivatives (Details) - Call Option [Member] - USD ($) $ in Thousands		3 Months Ended
	Mar. 31, 2026	Mar. 31, 2026	Mar. 31, 2025
Initial liabilities recognized for premiums received by period-end	$ 35	$ 35
Ending written-call derivative liability	21	21
Realized expiration/settlement gain	35
Open written-call fair-value loss	(21)
Net written-call income	$ 14	$ 14	$ (0)

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References + Details

Note 8 - Convertible Notes, Embedded Derivatives and Pre-Funded Warrants - Schedule of Debt and Other Financing Activities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($)
Gross convertible notes payable	$ 4,350
Unamortized debt discount	(62)
Convertible notes payable, net of discount	699
Accrued interest payable	44
Issuance of pre-funded warrants / allocated APIC	1,420
Day-one loss on derivative liability	(1,083)
Gain on change in fair value of embedded derivatives	591
Coupon interest expense	(44)
Total interest expense	113
Embedded Conversion Features [Member]
Derivative liabilities	3,708
Convertible Debt [Member]
Unamortized debt discount	$ (3,651)

Note 7 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Fair Value, by Balance Sheet Grouping [Table Text Block]

Fair value hierarchy by instrument (USD in thousands)	March 31, 2026 total fair value		Level 1		Level 2		Level 3
Bitcoin digital assets		4,709		4,709		—		—
Embedded conversion derivative liability		3,708		—		—		3,708
Written covered Bitcoin call derivative liability		21		—		—		21

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Level 3 derivative liability rollforward (USD in thousands)	Embedded conversion derivative liability			Written covered Bitcoin call derivative liability
Beginning balance, January 1, 2026		—			—
Initial recognition / issuances		5,383			35
Change in fair value recognized in earnings, net		(1,675	)		21
Settlements / expirations / conversions		—			(35	)
Transfers into or out of Level 3		—			—
Ending balance, March 31, 2026		3,708			21

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2026
Trading Arrangements, by Individual [Table]
Material Terms of Trading Arrangement [Text Block]	Item 5. Other Information. a) None. b) None. c) During the three months ended March 31, 2026, none of our directors or officers adopted or terminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement” (in each case defined in Item 408 of Regulation S-K).
Rule 10b5-1 Arrangement Terminated [Flag]	false
Non-Rule 10b5-1 Arrangement Terminated [Flag]	false
Rule 10b5-1 Arrangement Adopted [Flag]	false
Non-Rule 10b5-1 Arrangement Adopted [Flag]	false

Note 5 - Digital Assets - Schedule of Digital Assets (Details)	3 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)
ASC 350-60 fair value remeasurement gain/(loss)	$ (326,000)	$ (0)
Bitcoin [Member]
Balance, units	0
Balance, amount	$ 0
Purchases / acquisitions during period, units	68.49
Purchases / acquisitions during period, amount	$ 5,000
Written-call premium BTC received by period-end, units	0.51
Written-call premium BTC received by period-end, amount	$ 35
Dispositions / physical settlements, units	0
Dispositions / physical settlements, amount	$ 0
Balance, units	69.01
Balance, amount	$ 68,233
Balance, units	69.01
Balance, amount	$ 4,709
Carrying value before fair value mark / cost basis	5,035
ASC 350-60 fair value remeasurement gain/(loss)	$ (326)

Note 11 - Income Taxes (Details Textual) - USD ($) $ in Thousands	2 Months Ended	3 Months Ended
	Mar. 12, 2026	Mar. 31, 2026	Mar. 31, 2025
Income Tax Expense (Benefit)	$ 0	$ 0	$ 0

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (ee)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483475/205-20-45-3A

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-4

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-21

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-14

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482964/270-10-50-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12

Reference 10: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 231
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482663/740-10-55-231

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.7)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-8

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-9

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-10

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(9))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Subparagraph (a)
-SubTopic 20
-Topic 740
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482659/740-20-45-2

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h))
-SubTopic 10
-Topic 235
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

+ Details

Note 10 - Leases

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Lessee, Operating Leases [Text Block]

10. Leases

The Company’s lease balances relate to the Subsidiary and the legacy solar business. As of March 31, 2026, the related right-of-use asset and lease obligations were included in assets and liabilities of discontinued operations classified as held for sale because the lease was associated with the discontinued component. The lease measurement was calculated using a 122-month lease term and a weighted-average discount rate of 18.0%. Source lease amortization schedules and the December 31, 2025 lease support were maintained in euros; the amounts disclosed below are presented in U.S. dollars and rounded to the nearest thousand. Subsequent to quarter end, the SPA required the parties to use their best efforts to transfer the Munich lease to the Subsidiary as lessee by June 30, 2026, with a full release of the Company from further liability under the lease; if such transfer is not completed by that date, the Company has the right to terminate the lease agreement. The Company did not identify a material continuing lease obligation outside the discontinued operations disposal group as of March 31, 2026. See Note 4 (Discontinued Operations and Assets and Liabilities Held for Sale) and Note 16 (Subsequent Events) for the related disclosures.

The lease liability caption is presented together with other disposal-group liabilities because the disclosed amounts represent the total liabilities of the discontinued operations disposal group associated with the legacy solar business, including lease obligations. Lease cost and cash paid for lease liabilities for the three months ended March 31, 2026 and 2025 related to the discontinued component and are included in the discontinued operations amounts disclosed in Note 4; no material continuing lease cost or cash paid for leases was identified outside the discontinued operations disposal group.

Lease-related amounts and inputs included in HFS presentation (USD in thousands, except months and percentages)	March 31, 2026			December 31, 2025
Right-of-use assets included in held-for-sale assets		924			673
Lease liabilities and included in held-for-sale liabilities		652			673
Weighted-average lease term used in measurement (months)		122			122
Weighted-average discount rate		18	%		18	%

Note 7 - Fair Value Measurements - Schedule of Level 3 Derivatives (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($)
Embedded Conversion Features [Member]
Balance	$ 0
Initial recognition / issuances	5,383
Change in fair value recognized in earnings, net	(1,675)
Settlements / expirations / conversions	0
Transfers into or out of Level 3	0
Balance	3,708
Call Option [Member]
Balance	0
Initial recognition / issuances	35
Change in fair value recognized in earnings, net	21
Settlements / expirations / conversions	(35)
Transfers into or out of Level 3	0
Balance	$ 21

Note 16 - Subsequent Events (Details Textual) € / shares in Units, $ / shares in Units, € in Millions		3 Months Ended		12 Months Ended
	Apr. 28, 2026 USD ($) $ / shares	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)	May 04, 2026 € / shares shares	Apr. 29, 2026 EUR (€) € / shares
Impairment of Discontinued Operations		$ 519,000	$ 0
Debt Instrument, Face Amount		4,350,000
Proceeds from Convertible Debt		4,350,000	2,000,000
Subsequent Event [Member] \| April 2026 Debenture [Member]
Debt Instrument, Face Amount	$ 700,000
Debt Instrument, Interest Rate, Stated Percentage	12.00%
Debt Instrument, Default Rate	18.00%
Debt Instrument, Convertible, Conversion Price \| $ / shares	$ 18.75
Debt Instrument, Convertible, Conversion Price, Variable, Percentage of VWAP	85.00%
Proceeds from Convertible Debt	$ 700,000
Sono Motors GmbH [Member]
Impairment of Discontinued Operations		$ 519,000	$ (0)	$ (0)
Sono Motors GmbH [Member] \| Subsequent Event [Member]
Investment Owned, Balance, Shares (in shares) \| shares					33,588
Ownership Percentage					100.00%
Ownership Percentage Transferred					50.00%
Ownership Shares, Price Per Share (in EUR per Share) \| € / shares					€ 1	€ 1
Investment Owned, Balance, Principal Amount \| €						€ 10.5

Note 12 - Stockholders' Equity - Schedule of Stock (Details) - € / shares	Mar. 31, 2026	Dec. 31, 2025
Preferred shares, authorized (in shares)	1,401	1,401
Preferred shares, issued (in shares)	1,401	1,401
Preferred shares, outstanding (in shares)	1,401	1,401
Preferred Stock, Par or Stated Value Per Share (in EUR per Share)	€ 300	€ 300
Ordinary Shares [Member]
Common, shares authorized (in shares)	120,000,000	120,000,000
Common, shares issued (in shares)	1,424,834	1,424,834
Common, shares outstanding (in shares)	1,424,834	1,424,834
Common Stock, Par or Stated Value Per Share (in EUR per Share)	€ 0.01	€ 0.01
High Voting Shares [Member]
Common, shares authorized (in shares)	40,000	40,000
Common, shares issued (in shares)	40,000	40,000
Common, shares outstanding (in shares)	40,000	40,000
Common Stock, Par or Stated Value Per Share (in EUR per Share)	€ 0.25	€ 0.25

Note 9 - Accounts Payable, Accrued Expenses and Other Liabilities

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Accounts Payable and Accrued Liabilities Disclosure [Text Block]

9. Accounts Payable, Accrued Expenses and Other Liabilities

Accounts payable and accrued expenses detail (USD in thousands)	March 31, 2026		December 31, 2025
Legal fees		831		635
Accounting and auditing fees		123		103
Other accounts payable and accrued expenses		61		76
Total accounts payable and accrued expenses		1,015		814

Balance sheet caption (USD in thousands)	March 31, 2026		December 31, 2025
Accounts payable and accrued expenses		1,015		814
Accrued interest payable		44		—
VAT and other tax liabilities		26		87
Liabilities of discontinued operations classified as held for sale, including lease liabilities		1,029		983

Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Mar. 31, 2026	May 15, 2026
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
Document Transition Report	false
Entity File Number	001-41066
Entity Registrant Name	Sono Group N.V.
Entity Incorporation, State or Country Code	P7
Entity Tax Identification Number	98-1828632
Entity Address, Address Line One	4965 Trinidad Drive
Entity Address, City or Town	Land O’ Lakes
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	34639
City Area Code	1
Local Phone Number	352-502-1191
Title of 12(b) Security	Ordinary Shares
Trading Symbol	SSM
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		1,424,834
Entity Central Index Key	0001840416
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1
Amendment Flag	false

Note 10 - Leases - Schedule of Disposal of Lease (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Weighted-average lease term used in measurement (months) (Month)	122 months	122 months
Weighted-average discount rate	18.00%	18.00%
Subsidiary [Member]
Disposal Group, Including Discontinued Operation, Right-of-Use Assets	$ 924	$ 673
Lease and other disposal-group liabilities	$ 652	$ 673

Note 12 - Stockholders' Equity

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Equity [Text Block]

12. Stockholders’ Equity

During the three months ended March 31, 2026, the Company recognized $1,420 thousand of additional paid-in capital related to pre-funded warrants. Nominal values of the Company’s share capital are denominated in euros under Dutch corporate law.

The accumulated other comprehensive income (loss) column in the statement of shareholders’ equity reflects cumulative translation adjustments arising from the change in reporting- currency realignment and the translation of euro-functional operations, as described in Note 2 (Basis of Presentation, Consolidation and Summary of Significant Accounting Policies). Total shareholders’ equity in the statement of shareholders’ equity reconciles to total shareholders’ equity presented in the condensed consolidated balance sheet for each period presented.

Share capital	Authorized		Issued and outstanding at March 31, 2026		Issued and outstanding at December 31, 2025		Nominal value under Dutch corporate law
Ordinary shares		120,000,000		1,424,834		1,424,834	EUR 0.01
High voting shares		40,000		40,000		40,000	EUR 0.25
Preferred shares		1,401		1,401		1,401	EUR 300.00

- Definition

The entire disclosure for equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 20
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479951/505-20-S50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 20
-Name Accounting Standards Codification
-Section S25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479982/505-20-S25-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480070/505-10-S50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480100/505-10-S45-3

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480100/505-10-S45-2

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 20
-Name Accounting Standards Codification
-Section S50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479951/505-20-S50-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 20
-Name Accounting Standards Codification
-Section S25
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479982/505-20-S25-2

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 4.C)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-4

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481520/505-30-50-2

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 20
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 1.D.2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479921/505-20-S99-1

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 20
-Name Accounting Standards Codification
-Section S50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479951/505-20-S50-3

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 1.B.3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480148/855-10-S99-1

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 20
-Name Accounting Standards Codification
-Section S25
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479982/505-20-S25-3

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/505/tableOfContent

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-11

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(31))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-5

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-14

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477968/946-235-50-2

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477968/946-235-50-2

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478448/946-505-50-6

Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-6

Reference 31: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 32: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 33: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-14

Reference 34: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-14

Reference 35: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-16

+ Details

Note 12 - Stockholders' Equity (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($)
Adjustments to Additional Paid in Capital, Warrant Issued	$ 1,420
Pre-Funded Warrant [Member]
Adjustments to Additional Paid in Capital, Warrant Issued	$ 1,420

Note 16 - Subsequent Events

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Subsequent Events [Text Block]

16. Subsequent Events

The Company has evaluated subsequent events through the date these condensed consolidated financial statements were issued. The following event occurring subsequent to March 31, 2026 is disclosed below.

Disposition of Sono Motors GmbH.

On May 4, 2026, the Company entered into a Share Purchase and Transfer Agreement (the “SPA”) with (i) Vorratsla-160 M UG (haftungsbeschränkt) (in the future, OZERA UG (haftungsbeschränkt)), a German limited liability company whose sole shareholder is Denis Azhar, and (ii) Vorratsla-161 M UG (haftungsbeschränkt) (in the future, JanSol Invest UG (haftungsbeschränkt)), a German limited liability company whose sole shareholder is Jan Schiermeister (together, the “Purchasers”), and the Subsidiary. Mr. Azhar and Mr. Schiermeister are the current managing directors of the Subsidiary.

Pursuant to the SPA, the Company sold and transferred to the Purchasers, with immediate legal effect under German law and without conditions precedent, all 33,588 shares representing 100% of the outstanding share capital of the Subsidiary, with 50% transferred to each Purchaser. The purchase price for the shares was €1.00 in the aggregate. Simultaneously, the Company sold and assigned to the Purchasers its shareholder loan repayment claim against the Subsidiary, including accrued interest, with an outstanding amount of approximately €10.5 million as of April 29, 2026, for an aggregate purchase price of €1.00. Each Purchaser’s portion of the shareholder loan repayment claim is subject to (i) a two-year standstill undertaking by the Purchasers and (ii) a qualified subordination (qualifizierter Rangrücktritt) pursuant to German insolvency law under which the claim is subordinated to all other present and future creditors of the Subsidiary.

In connection with the SPA, the Company and the Subsidiary agreed to terminate their corporate services agreement with retroactive effect as of April 30, 2026. The SPA also requires the parties to use their best efforts to cause the lease agreement for the premises located at Waldmeisterstraße 93, 80935 Munich, Germany, under which the Company is the current lessee, to be transferred to the Subsidiary as lessee by no later than June 30, 2026, with a full release of the Company from any further liability thereunder; if such transfer is not completed by that date, the Company has the right to terminate the lease agreement. The Subsidiary granted the Company a worldwide, limited, non-exclusive, non-transferable, royalty-free, irrevocable license to use the “Sono” brand as company name and in connection with the Company's stock exchange listing, securities trading or stock ticker. The SPA is governed by the laws of Germany, and disputes arising under the SPA are subject to binding arbitration in Munich, Germany.

Following the signing date of the SPA, the Company no longer holds any equity interest in, or exercises any control over, the Subsidiary. The Company will deconsolidate the Subsidiary upon loss of control in the second quarter of 2026 and will recognize any resulting gain or loss within discontinued operations in the period in which loss of control occurs.

Because the Company recognized a $519 thousand loss on classification as held for sale in the first quarter of 2026 to reduce the disposal group based on the planned sale and nominal consideration subsequently documented in the SPA, the Company does not expect to recognize that same amount again as a deconsolidation loss in the second quarter of 2026. The final gain or loss on deconsolidation will be determined based on the Company’s consolidated U.S. GAAP carrying amounts at the date control is lost, after considering the held-for-sale impairment recognized in the first quarter, sale-date changes, release of any cumulative translation adjustment attributable to the Subsidiary, taxes, transaction costs, retained obligations and other closing adjustments.

The SPA described above is the operative transaction document for the assignment of the shareholder loan repayment claim, including the approximately €10.5 million outstanding amount as of April 29, 2026, the aggregate €1.00 consideration, the two-year standstill and the qualified subordination terms described above. The shareholder loan receivable recorded by the Company and the corresponding payable recorded by the Subsidiary were intra-entity balances eliminated in consolidation prior to the transaction. Accordingly, the shareholder loan was not included as a separate consolidated receivable or liability in the held-for-sale impairment or deconsolidation analysis. For consolidated reporting purposes, the assignment of the shareholder loan claim as part of the SPA affects the sale and deconsolidation analysis in the period in which control is lost, rather than creating a separate receivable in the March 31, 2026 consolidated balance sheet. Parent-company stand-alone accounting for the shareholder loan may differ from the consolidated accounting treatment described herein.

Additional Financing.

Subsequent to March 31, 2026, on April 28, 2026, the Company received an additional tranche of funding from YA II PN, Ltd. (“Yorkville”) in the form of a convertible debenture issued by the Company to Yorkville in the aggregate principal amount of $700 thousand (the “April 2026 Debenture”).

The April 2026 Debenture matures on April 28, 2027, which maturity date may be extended at the option of Yorkville. Further, interest accrues on the outstanding principal balance of the April 2026 Debenture at an annual rate of 12%, which will increase to an annual rate of 18% upon an Event of Default (as defined in the April 2026 Debenture), for so long as such Event of Default remains uncured. Yorkville will have the right to convert the April 2026 Debenture into ordinary shares of the Company at the lower of (i) a price per ordinary share equal to $18.75 or (ii) 85% of the lowest daily volume weighted average price of the ordinary shares during the seven consecutive trading days immediately preceding the conversion date or other date of determination (the “Variable Conversion Price”); provided that the Variable Conversion Price may not be lower than the Floor Price (as defined in the April 2026 Debenture) then in effect or the nominal value of one ordinary share. Net proceeds to the Company from the April 2026 Debenture were $700,000.

The April 2026 Debenture was issued without registration under the Securities Act of 1933, as amended (the “Securities Act”), in reliance on the exemptions provided by Section 4(a)(2) of the Securities Act as a transaction not involving a public offering and in reliance on similar exemptions under applicable state laws. Any ordinary shares of the Company issuable upon conversion of the April 2026 Debenture will be issued without registration under the Securities Act in reliance on applicable exemptions therefrom.

The foregoing description of the April 2026 Debenture does not purport to be complete and is qualified in its entirety by reference to the full text of the April 2026 Debenture, which is attached to this Quarterly Report as Exhibit 10.11 and is incorporated herein by reference.

Because the funding under the April 2026 Debenture occurred after March 31, 2026, the additional tranche is not reflected in the Company’s condensed consolidated balance sheet, notes payable balance, fair value measurement or notes payable rollforward as of and for the three months ended March 31, 2026.

Note 7 - Fair Value Measurements (Details Textual)	Mar. 31, 2026 USD ($)	Dec. 31, 2025
Call Option [Member]
Ending written-call derivative liability	$ 21,000
Embedded Conversion Features [Member] \| Measurement Input, Share Price [Member]
Derivative Liability, Measurement Input	6.33
Embedded Conversion Features [Member] \| Measurement Input, Price Volatility [Member]
Derivative Liability, Measurement Input	1.10
Embedded Conversion Features [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Derivative Liability, Measurement Input	0.0425
Embedded Conversion Features [Member] \| Measurement Input, Expected Term [Member]
Derivative Liability, Measurement Input	0.85
Bitcoin [Member]
Crypto Asset, Spot Price	$ 68,233
Crypto Asset, Number of Units	69.01	0
Bitcoin [Member] \| Call Option [Member]
Crypto Asset, Spot Price	$ 68,233
Crypto Asset, Number of Units	0.31053491

Note 8 - Convertible Notes, Embedded Derivatives and Pre-Funded Warrants - Schedule of Convertible Debt (Details)	3 Months Ended
	Mar. 31, 2026 USD ($) $ / shares
Principal amount \| $	$ 4,350,000
January Debenture [Member]
Issue date	Jan. 26, 2026
Principal amount \| $	$ 600,000
Maturity	Jan. 26, 2027
Debt Instrument, Interest Rate, Stated Percentage	12.00%
Debt Instrument, Default Rate	18.00%
Fixed conversion price (in dollars per share)	$ 18.75
Variable conversion price	85.00%
January Debenture [Member] \| Minimum [Member]
Fixed conversion price (in dollars per share)	$ 1.42
February Debenture [Member]
Issue date	Feb. 19, 2026
Principal amount \| $	$ 750,000
Maturity	Feb. 19, 2027
Debt Instrument, Interest Rate, Stated Percentage	12.00%
Debt Instrument, Default Rate	18.00%
Fixed conversion price (in dollars per share)	$ 18.75
Variable conversion price	85.00%
February Debenture [Member] \| Minimum [Member]
Fixed conversion price (in dollars per share)	$ 1.45
March Debenture [Member]
Issue date	Mar. 10, 2026
Principal amount \| $	$ 3,000,000
Maturity	Mar. 10, 2027
Debt Instrument, Interest Rate, Stated Percentage	12.00%
Debt Instrument, Default Rate	18.00%
Fixed conversion price (in dollars per share)	$ 18.75
Variable conversion price	85.00%
March Debenture [Member] \| Minimum [Member]
Fixed conversion price (in dollars per share)	$ 1.39

Note 13 - Net Income (Loss) Per Share

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Earnings Per Share [Text Block]

13. Net Income (Loss) Per Share

Basic net income (loss) per share is computed by dividing net income (loss) by the weighted-average shares outstanding during the period. Diluted net income (loss) per share gives effect to potentially dilutive securities when their effect is dilutive. For Q1 2026, potentially dilutive securities were excluded because the Company reported a net loss and inclusion would have been anti-dilutive.

Net income (loss) per share	Three months ended March 31, 2026			Three months ended March 31, 2025
Numerator:
Income (loss) from continuing operations		(1,002	)		9,300
Loss from discontinued operations, net of tax		(1,013	)		(1,498	)
Net income (loss)		(2,015	)		7,802
Denominator:
Weighted average shares outstanding - basic		1,464,834			1,449,918
Dilutive effect of potential ordinary shares		—			8,852,935
Weighted average shares outstanding - diluted		1,464,834			10,302,853
Basic net income (loss) per share:
Continuing operations	$	(0.68	)	$	6.41
Discontinued operations	$	(0.69	)	$	(1.03	)
Net income (loss) per share - basic	$	(1.38	)	$	5.38
Diluted net income (loss) per share:
Continuing operations	$	(0.68	)	$	0.90
Discontinued operations	$	(0.69	)	$	(0.15	)
Net income (loss) per share - diluted	$	(1.38	)	$	0.75

Note 9 - Accounts Payable, Accrued Expenses and Other Liabilities (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]

Accounts payable and accrued expenses detail (USD in thousands)	March 31, 2026		December 31, 2025
Legal fees		831		635
Accounting and auditing fees		123		103
Other accounts payable and accrued expenses		61		76
Total accounts payable and accrued expenses		1,015		814

Balance sheet caption (USD in thousands)	March 31, 2026		December 31, 2025
Accounts payable and accrued expenses		1,015		814
Accrued interest payable		44		—
VAT and other tax liabilities		26		87
Liabilities of discontinued operations classified as held for sale, including lease liabilities		1,029		983

Note 5 - Digital Assets

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Crypto Asset [Text Block]

5. Digital Assets

During the three months ended March 31, 2026, the Company acquired Bitcoin as part of the Treasury Strategy. The Company’s digital asset holdings consist of Bitcoin and are presented separately on the face of the unaudited condensed consolidated balance sheets. See Note 2 (Basis of Presentation, Consolidation and Summary of Significant Accounting Policies) for the Company’s accounting policies for crypto assets, written covered Bitcoin call options and digital asset treasury income (loss), net, and Note 7 (Fair Value Measurements) for the related fair value measurement disclosures.

The Company’s Bitcoin holdings expose the Company to concentration risk in a single digital asset and to market, custody, counterparty, regulatory, execution and liquidity risks. The fair value of Bitcoin may change materially over short periods, and changes in fair value are recognized in earnings each reporting period. Bitcoin holdings may also be affected by written-call option arrangements, collateral requirements, settlement mechanics and restrictions or practical limitations associated with custody or monetization.

Digital asset rollforward (USD in thousands, except BTC units and USD price per BTC)	BTC units		USD amount
Beginning balance		—		—
Bitcoin purchased / deposited during period		68.49		5,000
Settled BTC premiums received on Q1 written covered calls		0.51		35
Dispositions / physical settlements		—		—
Ending BTC holdings at March 31, 2026		69.01
Period-end BTC price (USD per BTC)		—	$	68,233
Ending Bitcoin fair value (69.01 BTC x $68,233.31; calculated using unrounded BTC units)		69.01		4,709
Cost basis / carrying value before ASC 350-60 fair value remeasurement		69.01		5,035
ASC 350-60 fair value remeasurement gain/(loss)		—		(326	)

BTC units in the table are rounded to the nearest hundredth for presentation. The unit rollforward and ending fair value are calculated using unrounded BTC units from the Company’s Bitcoin treasury valuation support; therefore, rounded displayed unit amounts may not recompute exactly. The settled BTC premium line represents BTC premiums received on written covered calls that expired out of the money before quarter-end.

The digital asset rollforward reflects activity through March 31, 2026 only. The April 3, 2026 Blockchain.com activity report includes post-quarter activity and therefore does not represent the March 31, 2026 BTC-unit balance. The March 31, 2026 balance includes the original 68.49313568 BTC collateral deposit plus 0.51462318 BTC of premiums from written covered Bitcoin calls that expired out of the money by quarter-end.

Note 13 - Net Income (Loss) Per Share - Summary of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		15 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026
Income (loss) from continuing operations	$ (1,002)	$ 9,300
Income (loss) from discontinued operations, net of tax	(1,013)	(1,498)
Net income (loss)	$ (2,015)	$ 7,802	$ 7,802
Basic (in shares)	1,464,834	1,449,918
Dilutive effect of potential ordinary shares (in shares)	0	8,852,935
Diluted (in shares)	1,464,834	10,302,853
Continuing operations (in dollars per share)	$ (0.68)	$ 6.41
Discontinued operations (in dollars per share)	(0.69)	(1.03)
Net income (loss) per share - basic (in dollars per share)	(1.38)	5.38
Continuing operations (in dollars per share)	(0.68)	0.9
Discontinued operations (in dollars per share)	(0.69)	(0.15)
Net income (loss) per share - diluted (in dollars per share)	$ (1.38)	$ 0.75

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current Assets
Cash	$ 237	$ 243
Digital assets / Bitcoin treasury	4,709
Prepaid taxes and VAT receivables	7	121
Prepaid expenses and other current assets	59	138
Assets of discontinued operations classified as held for sale, including right-of-use assets	1,026	1,169
Total Assets	6,038	1,671
Current Liabilities
Accounts payable and accrued expenses	1,015	814
Accrued interest payable	44
Convertible notes payable, net of discount	699
Liabilities of discontinued operations classified as held for sale, including lease liabilities	1,029	983
Total Liabilities	6,516	1,797
Shareholders’ Equity
Preferred Shares, par value €300.00 per share, 1,401 shares authorized, 1,401 and 1,401 shares issued and outstanding as of March 31, 2026 and December 31, 2025, respectively	456	456
Additional paid-in capital	343,504	342,084
Accumulated deficit	(335,405)	(333,390)
Accumulated other comprehensive income (loss)	(9,057)	(9,300)
Total Shareholders’ Equity	(478)	(126)
Total Liabilities and Shareholders’ Equity	6,038	1,671
Ordinary Shares [Member]
Shareholders’ Equity
Ordinary Shares and High Voting Shares	14	14
High Voting Shares [Member]
Shareholders’ Equity
Ordinary Shares and High Voting Shares	10	$ 10
Embedded Conversion Features [Member]
Current Liabilities
Derivative liabilities	3,708
Call Option [Member]
Current Liabilities
Derivative liabilities	$ 21

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Digital asset treasury loss, net	$ (313)
General and administrative expenses	(1,167)	$ (1,018)
Loss from continuing operations	(1,480)	(1,018)
Other Income (Expenses)
Gain on change in fair value of convertible notes payable carried at fair value	0	10,331
Gain on change in fair value of embedded derivative liabilities	591
Interest expense, including amortization of debt discount	113
Foreign currency loss, net		(13)
Total other income, net	478	10,318
Income (loss) from continuing operations before income taxes	(1,002)	9,300
Income tax expense	0	0
Income (loss) from continuing operations	(1,002)	9,300
Loss from discontinued operations, net of tax	(1,013)	(1,498)
Net income / (loss)	$ (2,015)	$ 7,802
Net income per share to common shareholders - basic:
Continuing operations (in dollars per share)	$ (0.68)	$ 6.41
Discontinued operations (in dollars per share)	(0.69)	(1.03)
Net (loss)/income per share - basic (in dollars per share)	(1.38)	5.38
Net income per share to common shareholders - diluted:
Continuing operations (in dollars per share)	(0.68)	0.9
Discontinued operations (in dollars per share)	(0.69)	(0.15)
Net (loss)/income per share - diluted (in dollars per share)	$ (1.38)	$ 0.75
Basic (in shares)	1,464,834	1,449,918
Diluted (in shares)	1,464,834	10,302,853

Note 8 - Convertible Notes, Embedded Derivatives and Pre-Funded Warrants

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Debt Disclosure [Text Block]

8. Convertible Notes, Embedded Derivatives and Pre-Funded Warrants

During the three months ended March 31, 2026, the Company issued three convertible debentures and one pre-funded warrant to YA II PN, Ltd. The following tables summarize the contractual terms and reconcile the related debt host, embedded conversion derivative liability, accrued interest payable, pre-funded warrant proceeds and APIC allocation to the balance sheet, statement of operations, statement of cash flows and shareholders’ equity presentation.

Convertible debenture terms	January Debenture		February Debenture		March Debenture
Issue date	Jan. 26, 2026		Feb. 19, 2026		Mar. 10, 2026
Principal amount	$	600,000	$	750,000	$	3,000,000
Maturity	Jan. 26, 2027		Feb. 19, 2027		Mar. 10, 2027
Interest rate	12%; 18% upon event of default		12%; 18% upon event of default		12%; 18% upon event of default
Fixed conversion price	$	18.75	$	18.75	$	18.75
Variable conversion price	85% of lowest daily VWAP over seven trading days, subject to floor		85% of lowest daily VWAP over seven trading days, subject to floor		85% of lowest daily VWAP over seven trading days, subject to floor
Floor price	$	1.42	$	1.45	$	1.39

Convertible debt, warrant and related financial statement presentation reconciliation (USD in thousands)	Amount, KUSD
Balance Sheet – March 31, 2026
Gross convertible notes payable		4,350
Unamortized debt discount		(3,651	)
Convertible notes payable, net of discount		699
Embedded conversion derivative liability		3,708
Accrued interest payable		44
Pre-funded warrant APIC (equity)		1,420
Income Statement –Months Ended March 31, 2026
Day-one loss on derivative liability		(1,083	)
Gain on change in fair value of embedded derivatives		591
Coupon interest expense		(44	)
Debt discount amortization expense		(62	)
Total interest expense		113

The initial fair value of the bifurcated embedded conversion derivative liabilities exceeded the cash proceeds allocated to the debt host because the valuation reflects the variable conversion features, floor prices and probability-weighted settlement outcomes under the convertible debenture terms. This resulted in a recognized loss of $1,083.

The embedded conversion features were bifurcated and recognized as derivative liabilities measured at fair value. Changes in fair value are recognized in earnings. Debt discount is amortized to interest expense over the expected term of the convertible debentures. The balance sheet presentation separates (i) the convertible debt host, net of unamortized discount, (ii) accrued interest payable, and (iii) embedded conversion derivative liabilities. Accrued interest payable is not included in convertible notes payable, net of discount, because it represents separately accrued contractual coupon interest. Cash proceeds from convertible debentures and pre-funded warrants are presented as financing cash inflows, the pre-funded warrant APIC allocation is presented within shareholders’ equity, and the embedded conversion derivative liabilities and convertible debt host are presented as separate balance sheet captions.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-8

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-9

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477092/405-40-50-1

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477092/405-40-50-1

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477092/405-40-50-1

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477092/405-40-50-1

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477092/405-40-50-1

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 24: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 470
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/470/tableOfContent

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1C
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1C

Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1C
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1C

Reference 31: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1C
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1C

Reference 32: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1E
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1E

Reference 33: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1I

Reference 34: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1I

Reference 35: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1I

+ Details

Note 6 - Written Covered Bitcoin Call Options

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Written Covered Crypto Assets Disclosure [Text Block]

6. Written Covered Bitcoin Call Options

The Company writes covered Bitcoin call options and receives option premiums. During the three months ended March 31, 2026, the Company received 0.51462318 BTC of premiums on written covered Bitcoin call options that expired out of the money before quarter-end. Written call options are derivative liabilities while outstanding. Premiums received are not revenue from contracts with customers and are recognized through derivative fair-value remeasurement, expiration, close-out or settlement. The written-call strategy may generate premium income but may also limit the Company’s participation in increases in Bitcoin prices and expose the Company to derivative valuation, collateral, counterparty, settlement and liquidity risks.

At March 31, 2026, the Company recognized a $21 thousand derivative liability for the open April 3, 2026 written covered Bitcoin call option. The liability was calculated as 0.31053491 BTC multiplied by the March 31, 2026 BTC-USD spot price of $68,233.31, observed at 23:59:59 UTC on March 31, 2026 from the market in which the Company transacts through Blockchain.com, rounded to the nearest thousand. The fair value of written-call liabilities may increase with increases in Bitcoin spot price, implied volatility or remaining contractual term.

Written covered-call derivative liability rollforward (USD in thousands)	Amount
Initial liabilities recognized for premiums received by period-end		35
Ending written-call derivative liability		21
Realized expiration/settlement gain		35
Open written-call fair-value loss		(21	)
Net written-call income		14

Note 15 - Related Party Transactions

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

15. Related Party Transactions

The Company evaluates relationships and transactions for related-party disclosure under applicable SEC and U.S. GAAP requirements. The Company considered its financing arrangements, preferred share arrangements, voting limitations, conversion rights, applicable beneficial-ownership limitations, including the 4.99% limitation, and other contractual arrangements with Yorkville in evaluating related-party disclosure. Based on this evaluation and consistent with the Company’s historical treatment of similar arrangements, management identified Yorkville as a related party on the basis that YA II PN, Ltd. is the sole holder of the Company’s outstanding Preferred Shares, which constitute 100% of that class of the Company’s issued share capital, and that Yorkville has maintained a long-standing and material financing relationship with the Company. See Note 8 (Convertible Notes, Embedded Derivatives and Pre-Funded Warrants), Note 12 (Stockholders’ Equity) and Note 16 (Subsequent Events) for additional information. No additional related-party transactions have been identified other than matters disclosed elsewhere in this Quarterly Report relating to financing, governance and the disposition of the legacy solar operations conducted through the Subsidiary.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

+ Details

Note 5 - Digital Assets (Details Textual)	Mar. 31, 2026
Bitcoin Collateral Deposit [Member]
Crypto Asset, Number of Units	68.49313568
Bitcoin of Written Premiums [Member]
Crypto Asset, Number of Units	0.51462318

Note 13 - Net Income (Loss) Per Share (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

Net income (loss) per share	Three months ended March 31, 2026			Three months ended March 31, 2025
Numerator:
Income (loss) from continuing operations		(1,002	)		9,300
Loss from discontinued operations, net of tax		(1,013	)		(1,498	)
Net income (loss)		(2,015	)		7,802
Denominator:
Weighted average shares outstanding - basic		1,464,834			1,449,918
Dilutive effect of potential ordinary shares		—			8,852,935
Weighted average shares outstanding - diluted		1,464,834			10,302,853
Basic net income (loss) per share:
Continuing operations	$	(0.68	)	$	6.41
Discontinued operations	$	(0.69	)	$	(1.03	)
Net income (loss) per share - basic	$	(1.38	)	$	5.38
Diluted net income (loss) per share:
Continuing operations	$	(0.68	)	$	0.90
Discontinued operations	$	(0.69	)	$	(0.15	)
Net income (loss) per share - diluted	$	(1.38	)	$	0.75

Note 4 - Discontinued Operations and Assets and Liabilities Held for Sale

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]

4. Discontinued Operations and Assets and Liabilities Held for Sale

On March 14, 2026, the Company’s supervisory board resolved to terminate all current and future funding commitments to the Subsidiary and to exit the legacy solar operations conducted through the Subsidiary with immediate effect. The Company was in negotiations to sell the Subsidiary before March 31, 2026, and subsequent to March 31, 2026 executed a share purchase agreement to sell the Subsidiary. Management concluded that the Subsidiary met the criteria to be classified as held for sale as of March 31, 2026 and that the planned disposition (which was completed subsequent to quarter end on May 4, 2026, as further described under Note 16 (Subsequent Events)) represents a strategic shift that has had, or will have, a major effect on the Company’s operations and financial results.

Management’s held-for-sale conclusion was based on the approval of a plan to sell the Subsidiary, management’s commitment to the plan, active negotiations with a buyer, the availability of the disposal group for immediate sale in its then-present condition subject only to customary closing conditions, the expectation that the sale would be completed within one year, and the determination that actions required to complete the plan indicated it was unlikely that significant changes would be made or that the plan would be withdrawn.

The disposal group was measured at the lower of carrying amount or fair value less cost to sell. Based on the planned sale and nominal consideration subsequently documented in the executed SPA, management recognized a $519 thousand loss on classification as held for sale within discontinued operations, net of tax, during the three months ended March 31, 2026. The shareholder loan receivable from the Subsidiary and corresponding payable of the Subsidiary were intra-entity balances and were eliminated in consolidation while the Subsidiary remained consolidated; accordingly, the shareholder loan was not included as a separate consolidated held-for-sale asset or impairment charge. See Note 16 (Subsequent Events) for the SPA terms governing the post-quarter assignment of the shareholder loan claim.

The results of operations of the Subsidiary have been presented as discontinued operations for all periods presented. The related assets and liabilities have been presented separately as held for sale in the unaudited condensed consolidated balance sheets. Parent-company public-company costs, SEC reporting costs, financing costs, digital-asset treasury costs and general holding-company overhead remain in continuing operations unless directly attributable to the discontinued component. The discontinued operation was reported within the Company’s single reportable segment.

As of March 31, 2026 and December 31, 2025, certain lease-related amounts recorded by Sono N.V., including approximately $0.9 million of right-of-use assets at March 31, 2026, relate to lease arrangements associated with the Subsidiary and the legacy solar business. Because the right-of-use assets and related lease liabilities are attributable to the discontinued component, the amounts are included in discontinued operations and in the disposal group classified as held for sale.

Major classes of assets of discontinued operations classified as held for sale (USD in thousands)	March 31, 2026			December 31, 2025
Right-of-use assets		924			673
Other disposal-group assets		621			496
Valuation allowance / impairment recognized on classification as held for sale		(519	)		—
Total assets of discontinued operations classified as held for sale		1,026			1,169

Major classes of liabilities of discontinued operations classified as held for sale (USD in thousands)	March 31, 2026		December 31, 2025
Lease liabilities		652		673
Other disposal-group liabilities		377		310
Total liabilities of discontinued operations classified as held for sale		1,029		983

Major line items included in income (loss) from discontinued operations (USD in thousands)	Three months ended March 31, 2026			Three months ended March 31, 2025
Revenue		174			31
Cost of revenue / cost of sales		(128	)		(24	)
Gross profit		46			7
Selling and distribution expenses		(113	)		(271	)
General and administrative expenses		(242	)		(706	)
Research and development expenses		(258	)		(529	)
Other operating income, net		77			1
Loss from operations of discontinued operations		(490	)		(1,498	)
Foreign currency loss, net		(4	)		—
Loss on classification as held for sale / impairment of disposal group		(519	)		—
Loss from discontinued operations before income taxes		(1,013	)		(1,498	)
Income tax expense		—			—
Loss from discontinued operations, net of tax		(1,013	)		(1,498	)

Discontinued operations cash-flow information (USD in thousands)	Three months ended March 31, 2026		Three months ended March 31, 2025
Net cash provided by (used in) operating activities of discontinued operations		170		(806	)
Effect of exchange-rate changes on cash of discontinued operations		—		(21	)
Net increase (decrease) in cash of discontinued operations		170		(827	)
Cash of discontinued operations, beginning of period		53		1,357
Cash of discontinued operations, end of period		223		530
Depreciation and amortization included in discontinued operations		9		8

Cash and held-for-sale presentation bridge (USD in thousands)	March 31, 2026		December 31, 2025
Cash and cash equivalents presented in continuing current assets		237		243
Cash of discontinued operations included in assets classified as held for sale		223		53
Total cash and cash equivalents including discontinued operations cash		460		296

Upon the May 4, 2026 sale of the Subsidiary and loss of control of the Subsidiary, the Company will deconsolidate the Subsidiary and recognize any resulting gain or loss within discontinued operations in the second quarter of 2026.

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash flows from operating activities
Net income (loss)	$ (2,015)	$ 7,802
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	9	8
Change in fair value of digital assets	326	0
Loss on classification as held for sale / impairment of discontinued operation	519	0
Gain on change in fair value of convertible notes payable carried at fair value	0	(10,331)
Interest expense, including amortization of debt discount	113	0
Debt discount amortization noncash component	28	0
Foreign currency and other noncash items	275	13
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(190)	(9)
Prepaid taxes and VAT receivables	95	(329)
Accounts payable and accrued expenses	289	(331)
Other operating assets and liabilities, including discontinued operations	(200)	595
Total changes in operating assets and liabilities	(6)	(74)
Net cash used in operating activities	(1,356)	(2,582)
Cash flows from investing activities
Purchase of digital assets / Bitcoin treasury	(5,000)	0
Property and equipment / other investing activity of discontinued operations	0	0
Net cash used in investing activities	(5,000)	0
Cash flows from financing activities
Proceeds from convertible debentures / debt financing	4,350	2,000
Proceeds from pre-funded warrants	2,000	0
Net cash provided by financing activities	6,350	2,000
Effect of exchange-rate changes and held-for-sale cash presentation on cash and cash equivalents
Effect of exchange-rate changes and held-for-sale cash presentation on cash and cash equivalents	0	(15)
Net decrease in cash and cash equivalents	(6)	(597)
Cash and cash equivalents, beginning of period	243	1,462
Cash and cash equivalents, end of period	237	865
Supplemental disclosure of cash flow information
Cash paid for interest	0	0
Supplemental disclosure of noncash financing and investing activities
Debt discount from derivative bifurcation	4,041	0
Derivative liability initial recognition	5,383	0
Pre-funded warrant APIC allocation	1,420	0
Bitcoin received as written-call premium	35	0
Call Option [Member]
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Net written covered-call derivative income/loss	(14)	0
Embedded Conversion Features [Member]
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Gain on change in fair value of embedded conversion derivative liabilities	$ (591)	$ 0

Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member] Ordinary Shares [Member]	Common Stock [Member] High Voting Shares [Member]	Preferred Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2024	1,409,885	40,000
Balance at Dec. 31, 2024	$ 30	$ 22		$ 322,475	$ (347,013)	$ (1,212)	$ (25,698)
Issuance of Ordinary Shares in connection with December 2024 reverse share split (in shares)	36
Net income (loss)					7,802		7,802
Other comprehensive income (loss) / translation adjustment						1,738	1,738
Balance (in shares) at Mar. 31, 2025	1,409,921	40,000
Balance at Mar. 31, 2025	$ 30	$ 22		322,475	(339,211)	526	(16,158)
Balance (in shares) at Dec. 31, 2024	1,409,885	40,000
Balance at Dec. 31, 2024	$ 30	$ 22		322,475	(347,013)	(1,212)	(25,698)
Net income (loss)							7,802
Other comprehensive income (loss) / translation adjustment							1,738
Balance (in shares) at Mar. 31, 2026	1,424,834	40,000	1,401
Balance at Mar. 31, 2026	$ 14	$ 10	$ 456	343,504	(335,405)	(9,057)	(478)
Balance (in shares) at Dec. 31, 2025	1,424,834	40,000	1,401
Balance at Dec. 31, 2025	$ 14	$ 10	$ 456	342,084	(333,390)	(9,300)	(126)
Net income (loss)					(2,015)		(2,015)
Other comprehensive income (loss) / translation adjustment						243	243
Balance (in shares) at Mar. 31, 2026	1,424,834	40,000	1,401
Balance at Mar. 31, 2026	$ 14	$ 10	$ 456	343,504	$ (335,405)	$ (9,057)	(478)
Issuance of pre-funded warrants / allocated APIC				$ 1,420			$ 1,420

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480070/505-10-S50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 4
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482705/350-40-65-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (e)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479719/606-10-65-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-7

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-5A

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 8: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 830
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479168/946-830-55-10

Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-4

Reference 10: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-21

Reference 11: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-14

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-4

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479857/480-10-S50-3

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479887/480-10-S45-3

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3A
-Subparagraph (24)(d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480244/480-10-S99-3A

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 105
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 9
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479343/105-10-65-9

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 17
-Subparagraph (d)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480336/718-10-65-17

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-6

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 60
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476176/805-60-65-1

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 323
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478666/740-323-65-2

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(B))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(A))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 27: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482765/220-10-50-6

Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-3

Reference 31: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480175/815-40-65-1

Reference 32: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 33: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iii)(A))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 34: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iv))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 35: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 36: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-8

Reference 37: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-9

Reference 38: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-11

Reference 39: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-11

Reference 40: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iv))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 41: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 42: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section 45
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479105/946-220-45-7

Reference 43: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(18))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 44: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(9))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 45: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(1)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3

Reference 46: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 47: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 48: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 60B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482689/260-10-45-60B

Reference 49: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 50: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-1A

Reference 51: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-1B

Reference 52: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 65
-Paragraph 4
-Subparagraph (f)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481538/470-20-65-4

Reference 53: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(22))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481372/852-10-55-10

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 830
-Name Accounting Standards Codification
-Section 55
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479168/946-830-55-12

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(19))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.6-05(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-2

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(4)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(7))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3

Reference 13: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 14: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 4.E)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480418/310-10-S99-2

+ Details

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - € / shares	Mar. 31, 2026	Dec. 31, 2025
Preferred Stock, Par or Stated Value Per Share (in EUR per Share)	€ 300	€ 300
Preferred Stock, Shares Authorized (in shares)	1,401	1,401
Preferred Stock, Shares Issued (in shares)	1,401	1,401
Preferred Stock, Shares Outstanding (in shares)	1,401	1,401
Ordinary Shares [Member]
Common Stock, Par or Stated Value Per Share (in EUR per Share)	€ 0.01	€ 0.01
Common Stock, Shares Authorized (in shares)	120,000,000	120,000,000
Common Stock, Shares, Issued (in shares)	1,424,834	1,424,834
Common Stock, Shares, Outstanding (in shares)	1,424,834	1,424,834
High Voting Shares [Member]
Common Stock, Par or Stated Value Per Share (in EUR per Share)	€ 0.25	€ 0.25
Common Stock, Shares Authorized (in shares)	40,000	40,000
Common Stock, Shares, Issued (in shares)	40,000	40,000
Common Stock, Shares, Outstanding (in shares)	40,000	40,000

Note 6 - Written Covered Bitcoin Call Options (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Schedule of Written Covered-call Derivatives [Table Text Block]

Written covered-call derivative liability rollforward (USD in thousands)	Amount
Initial liabilities recognized for premiums received by period-end		35
Ending written-call derivative liability		21
Realized expiration/settlement gain		35
Open written-call fair-value loss		(21	)
Net written-call income		14

Note 4 - Discontinued Operations and Assets and Liabilities Held for Sale (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Disposal Groups, Including Discontinued Operations [Table Text Block]

Major classes of assets of discontinued operations classified as held for sale (USD in thousands)	March 31, 2026			December 31, 2025
Right-of-use assets		924			673
Other disposal-group assets		621			496
Valuation allowance / impairment recognized on classification as held for sale		(519	)		—
Total assets of discontinued operations classified as held for sale		1,026			1,169

Major classes of liabilities of discontinued operations classified as held for sale (USD in thousands)	March 31, 2026		December 31, 2025
Lease liabilities		652		673
Other disposal-group liabilities		377		310
Total liabilities of discontinued operations classified as held for sale		1,029		983

Major line items included in income (loss) from discontinued operations (USD in thousands)	Three months ended March 31, 2026			Three months ended March 31, 2025
Revenue		174			31
Cost of revenue / cost of sales		(128	)		(24	)
Gross profit		46			7
Selling and distribution expenses		(113	)		(271	)
General and administrative expenses		(242	)		(706	)
Research and development expenses		(258	)		(529	)
Other operating income, net		77			1
Loss from operations of discontinued operations		(490	)		(1,498	)
Foreign currency loss, net		(4	)		—
Loss on classification as held for sale / impairment of disposal group		(519	)		—
Loss from discontinued operations before income taxes		(1,013	)		(1,498	)
Income tax expense		—			—
Loss from discontinued operations, net of tax		(1,013	)		(1,498	)

Discontinued operations cash-flow information (USD in thousands)	Three months ended March 31, 2026		Three months ended March 31, 2025
Net cash provided by (used in) operating activities of discontinued operations		170		(806	)
Effect of exchange-rate changes on cash of discontinued operations		—		(21	)
Net increase (decrease) in cash of discontinued operations		170		(827	)
Cash of discontinued operations, beginning of period		53		1,357
Cash of discontinued operations, end of period		223		530
Depreciation and amortization included in discontinued operations		9		8

Cash and held-for-sale presentation bridge (USD in thousands)	March 31, 2026		December 31, 2025
Cash and cash equivalents presented in continuing current assets		237		243
Cash of discontinued operations included in assets classified as held for sale		223		53
Total cash and cash equivalents including discontinued operations cash		460		296

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-3A

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 102
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483474/205-20-55-102

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483475/205-20-45-11

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 103
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483474/205-20-55-103

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5C
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-5C

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480781/205-20-S99-3

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-5C

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-5B

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-4B

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-3

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-1

Reference 13: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-1

+ Details

Note 11 - Income Taxes

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Income Tax Disclosure [Text Block]

11. Income Taxes

The Company recorded no income tax expense for the three months ended March 31, 2026 or March 31, 2025. The Company continues to maintain valuation allowances against deferred tax assets where realization is not more likely than not. Income tax expense associated with discontinued operations was not material for the periods presented.

- Definition

The entire disclosure for income tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477617/942-740-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478822/944-740-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 231
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482663/740-10-55-231

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12C

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12B

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 270
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477891/740-270-50-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.5.Q1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-13

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/740/tableOfContent

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-14

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-21

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 17
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-17

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-2

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482603/740-30-50-2

+ Details

Note 5 - Digital Assets (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Crypto Asset, Activity [Table Text Block]

Digital asset rollforward (USD in thousands, except BTC units and USD price per BTC)	BTC units		USD amount
Beginning balance		—		—
Bitcoin purchased / deposited during period		68.49		5,000
Settled BTC premiums received on Q1 written covered calls		0.51		35
Dispositions / physical settlements		—		—
Ending BTC holdings at March 31, 2026		69.01
Period-end BTC price (USD per BTC)		—	$	68,233
Ending Bitcoin fair value (69.01 BTC x $68,233.31; calculated using unrounded BTC units)		69.01		4,709
Cost basis / carrying value before ASC 350-60 fair value remeasurement		69.01		5,035
ASC 350-60 fair value remeasurement gain/(loss)		—		(326	)

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended	15 Months Ended
	Mar. 31, 2026	Mar. 31, 2026
Net income (loss)	$ (2,015)	$ 7,802
Foreign currency translation adjustment	243	1,738
Total other comprehensive income (loss)	243	1,738
Comprehensive income (loss)	$ (1,772)	$ 9,540

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Note 12 - Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Schedule of Stock by Class [Table Text Block]

Share capital	Authorized		Issued and outstanding at March 31, 2026		Issued and outstanding at December 31, 2025		Nominal value under Dutch corporate law
Ordinary shares		120,000,000		1,424,834		1,424,834	EUR 0.01
High voting shares		40,000		40,000		40,000	EUR 0.25
Preferred shares		1,401		1,401		1,401	EUR 300.00

- Definition

Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480070/505-10-S50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-11

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-5

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480100/505-10-S45-3

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480100/505-10-S45-2

Reference 9: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-10

Reference 10: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-8

Reference 11: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-7

Reference 12: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-6

Reference 13: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-5

Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 15: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 16: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-11

+ Details

Note 14 - Commitments and Contingencies

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Commitments and Contingencies Disclosure [Text Block]

14. Commitments and Contingencies

From time to time, the Company may be involved in claims and proceedings arising in the ordinary course of business. The Company records a liability for loss contingencies when a loss is probable and reasonably estimable. Management is not currently aware of any matter that it believes would have a material adverse effect on the Company’s condensed consolidated financial statements, except as otherwise disclosed in this Quarterly Report.

The Company’s commitments and contingencies include matters associated with the exit from the Subsidiary, lease-related obligations included in the discontinued operations disposal group, public-company obligations, financing arrangements and the Treasury Strategy.