Note 15 - Fair Value of Financial Instruments - Schedule of Level 3 Liabilities Reconciliation (Details) - Convertible Debt [Member] - EUR (€) € in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2025
Balance	€ 15,341	€ 15,305	€ 24,035	€ 24,035
Proceeds from new Borrowings	3,086	976	1,928
Fair value measurement (gain)/loss	35	(813)	(10,331)
Fair value measurement inclusive of foreign exchange (gain)/loss	9	(127)	(327)
Proceeds from new Borrowings	3,086	976	1,928
Debt Conversion	(18,471)
Balance	€ 0	€ 15,341	€ 15,305	€ 0

Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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Amount of gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Section 50
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

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Amount of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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