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Note 16 - Fair Value of Financial Instruments (Details Textual) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Convertible Notes Payable [Member]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings € 8,923 € 5,404