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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