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Note 2 - Significant Accounting Policies (Details Textual) € in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 EUR (€) shares | Dec. 31, 2023 EUR (€) shares | Dec. 31, 2022 shares
Income Tax Expense (Benefit) | € 0 | € 0 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | shares | 33,689 | 35,119 | 37,924
Convertible Debt, Indexed Common Shares (in shares) | shares | 15,771,230 |  |
Number of Operating Segments | 1 |  |
Research and Development Expense | € 1,118 | € 16,136 |
Accounts Payable and Other Accrued Liabilities, Current | 575 | 56,576 |
Retained Earnings (Accumulated Deficit) | € (321,428) | (386,454) |
Previously Reported [Member] |  |  |
Research and Development Expense |  | 15,783 |
Accounts Payable and Other Accrued Liabilities, Current |  | 55,798 |
Retained Earnings (Accumulated Deficit) |  | € (385,677) |
Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 5 years |  |
Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 7 years |  |

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