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Note 9 - Convertible Notes Payable at Fair Value - Convertible Debt (Details) (Parentheticals) € in Thousands, $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 EUR (€)
--- | --- | --- | --- | ---
Face value | $ | $ 27,656 |  | $ 20,000 |
Convertible Notes Due December 7, 2023 [Member] |  |  |  |
Face value | € |  | € 27,656 |  | € 27,656

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