v3.25.3
Note 8 - Convertible Notes Payable at Fair Value - Convertible Debt (Details)
€ in Thousands
Sep. 30, 2025
EUR (€)
shares
Sep. 30, 2025
$ / shares
Dec. 31, 2024
EUR (€)
shares
Dec. 31, 2024
$ / shares
Total Fair Value of Convertible Notes € 18,471   € 24,035  
Measurement Input, Indexed Common Shares [Member]        
Indexed common shares (in shares) | shares 7,718,300   18,537,485  
Measurement Input, Share Price [Member]        
Fair value per share (in dollars per share) | $ / shares   $ 2.79   $ 1.24
Convertible Notes Due December 7, 2023 [Member]        
Face value $30,906 convertible notes € 0   € 24,035