v3.26.1
Note 16 - Subsequent Events (Details Textual)
€ / shares in Units, $ / shares in Units, € in Thousands
12 Months Ended
Mar. 31, 2026
EUR (€)
Mar. 10, 2026
USD ($)
Feb. 24, 2026
USD ($)
Jan. 29, 2026
USD ($)
$ / shares
Dec. 31, 2025
EUR (€)
Dec. 31, 2024
EUR (€)
Mar. 10, 2026
€ / shares
Mar. 10, 2026
USD ($)
shares
Sep. 05, 2025
USD ($)
Dec. 31, 2024
USD ($)
Debt Instrument, Face Amount                 $ 34,856,000 $ 27,656,000
Proceeds from Convertible Debt | €         € 5,990 € 7,000        
Subsequent Event [Member]                    
Proceeds from Convertible Debt | € € 3,000                  
Proceeds from Issuance of Warrants | € € 2,000                  
Cash Payment, Liquidated Damages, Multiplication Percent               1.00%    
Subsequent Event [Member] | Minimum [Member]                    
Ownership Percentage               4.99%    
Subsequent Event [Member] | Maximum [Member]                    
Ownership Percentage               9.99%    
Subsequent Event [Member] | Pre-Funded Warrant [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares               283,367    
Warrants and Rights Outstanding               $ 2,000,004.29    
Proceeds from Issuance of Warrants   $ 2,000,004.29                
Class of Warrant or Right, Exercise Price of Warrants or Rights | € / shares             € 0.01      
Subsequent Event [Member] | January 2026 Debenture [Member] | Yorkville [Member]                    
Debt Instrument, Face Amount       $ 600,000            
Debt Instrument, Interest Rate, Stated Percentage       12.00%            
Debt Instrument, Default Rate       18.00%            
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares       $ 18.75            
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger       85.00%            
Proceeds from Convertible Debt       $ 600,000            
Subsequent Event [Member] | February 2026 Debenture [Member] | Yorkville [Member]                    
Debt Instrument, Face Amount     $ 750,000              
Debt Instrument, Interest Rate, Stated Percentage     12.00%              
Debt Instrument, Default Rate     18.00%              
Proceeds from Convertible Debt     $ 750,000              
Subsequent Event [Member] | March 2026 Debenture [Member] | Yorkville [Member]                    
Debt Instrument, Face Amount               $ 3,000,000    
Debt Instrument, Interest Rate, Stated Percentage               12.00%    
Debt Instrument, Default Rate               18.00%    
Proceeds from Convertible Debt   $ 3,000,000