v3.25.2
Note 8 - Convertible Notes Payable at Fair Value (Details Textual)
1 Months Ended 6 Months Ended 7 Months Ended 11 Months Ended
May 27, 2025
USD ($)
May 26, 2025
USD ($)
Apr. 24, 2025
USD ($)
Mar. 25, 2025
USD ($)
Mar. 25, 2025
EUR (€)
Feb. 12, 2025
EUR (€)
Dec. 30, 2024
EUR (€)
Dec. 07, 2022
USD ($)
$ / shares
Jan. 31, 2025
USD ($)
$ / shares
shares
Jun. 30, 2025
EUR (€)
Jun. 30, 2024
EUR (€)
Aug. 30, 2024
USD ($)
$ / shares
Nov. 30, 2023
$ / shares
Jun. 30, 2025
USD ($)
$ / shares
Jun. 30, 2025
EUR (€)
Dec. 31, 2024
USD ($)
Feb. 05, 2024
USD ($)
Nov. 30, 2023
€ / shares
Debt Instrument, Face Amount                             € 30,906 $ 27,656,000    
Proceeds from Convertible Debt | €                   € 2,904,000 € 7,000,000              
Conversion of Debt Into Perpetual Preferred Stock [Member]                                    
Debt Instrument, Convertible, Conversion Price | $ / shares                 $ 4                  
Debt Conversion, Converted Instrument, Shares Issuable | shares                 1,200                  
Debt Conversion, Converted Instrument, Shares Issuable, Preestablished Value Per Share | $ / shares                 $ 30,000                  
Debt Conversion, Converted Instrument, Share Issuable Amount                 $ 36,000,000                  
The 2022 Debentures [Member] | Yorkville [Member]                                    
Debt Instrument, Coupon Rate               4.00%                    
Debt Instrument, Convertible, Conversion Price | $ / shares               $ 1.75         $ 0.25          
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger               96.50%         85.00%          
Debt Instrument, Convertible, Threshold Consecutive Trading Days               7         7          
Debt Instrument, Default Rate               12.00%                    
The 2022 Debentures [Member] | Yorkville [Member] | Maximum [Member]                                    
Debt Instrument, Face Amount               $ 31,100,000                    
The 2022 Debentures [Member] | Yorkville [Member] | Minimum [Member]                                    
Debt Instrument, Convertible, Conversion Price | (per share)                         $ 0.006         € 0.06
February 2024 Debenture (Member) | Yorkville [Member]                                    
Debt Instrument, Face Amount                                 $ 4,300,000  
August 2024 Debenture [Member] | Yorkville [Member]                                    
Debt Instrument, Face Amount                       $ 3,300,000            
Omnibus Amendment to Transaction Documents [Member]                                    
Proceeds from Convertible Debt $ 750,000   $ 500,000   € 1,000,000 € 1,000,000                        
Omnibus Amendment to Transaction Documents [Member] | Yorkville [Member]                                    
Debt Instrument, Face Amount     $ 500,000 $ 1,000,000                   $ 1,560,000        
Proceeds from Convertible Debt   $ 750,000   $ 1,000,000                            
Omnibus Amendment to Transaction Documents [Member] | Yorkville [Member] | Maximum [Member]                                    
Proceeds from Convertible Debt | €             € 5,000,000                      
The 2024 Debentures [Member] | Yorkville [Member]                                    
Debt Instrument, Coupon Rate                       12.00%            
Debt Instrument, Convertible, Conversion Price | $ / shares                       $ 18.75            
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger                       85.00%            
Debt Instrument, Convertible, Threshold Consecutive Trading Days                       7            
Debt Instrument, Default Rate                       18.00%            
The 2024 Debentures [Member] | Yorkville [Member] | Minimum [Member]                                    
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger                       20.00%            
The 2025 Debentures [Member] | Yorkville [Member]                                    
Debt Instrument, Coupon Rate                           12.00% 12.00%      
Debt Instrument, Convertible, Conversion Price | $ / shares                           $ 1.75        
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger                   85.00%                
Debt Instrument, Convertible, Threshold Consecutive Trading Days                   7                
Debt Instrument, Default Rate                           18.00% 18.00%      
The 2025 Debentures [Member] | Yorkville [Member] | Minimum [Member]                                    
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger                   20.00%