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Note 9 - Convertible Notes Payable at Fair Value - Convertible Debt (Details) € in Thousands | Dec. 31, 2024 EUR (€) shares | Dec. 31, 2024 $ / shares | Dec. 31, 2023 EUR (€) shares | Dec. 31, 2023 $ / shares
--- | --- | --- | --- | ---
Indexed common shares (in shares) | shares | 15,771,230 |  |  |
Total Fair Value of Convertible Notes | € | € 24,035 |  | € 25,629 |
Measurement Input, Indexed Common Shares [Member] |  |  |  |
Indexed common shares (in shares) | shares | 18,537,485 |  | 12,441,365 |
Measurement Input, Share Price [Member] |  |  |  |
Fair value per share (in dollars per share) | $ / shares |  | $ 1.24 |  | $ 1.86
Convertible Notes Due December 7, 2023 [Member] |  |  |  |
Face value $27,656 convertible notes due December 7, 2023 (in default) | € | € 24,035 |  | € 25,629 |

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