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Share-based compensation (Details Narrative)
1 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2025
shares
Jun. 30, 2025
$ / shares
shares
Jul. 31, 2024
shares
Apr. 30, 2024
shares
Jun. 30, 2025
EUR (€)
€ / shares
shares
Dec. 31, 2024
€ / shares
shares
Jun. 30, 2024
EUR (€)
shares
Dec. 31, 2024
€ / shares
shares
Jun. 30, 2025
EUR (€)
€ / shares
shares
Jan. 01, 2024
shares
Dec. 31, 2023
shares
Share based payment award options outstanding number           970,308   970,308 1,465,815 586,923 586,923
Stock options, granted remaining amount           858,678   858,678 448,831 1,234,772  
Share-based compensation arrangement by share-based payment award, shares issued in period   23,007   147,783              
Expected term   10 years   2 years              
Share-based compensation arrangement by share-based payment award, options, forfeitures and expirations in period         56,482   204,265      
Stock options, granted         1,670,080            
Exercise price per share | $ / shares   $ 4.36                  
Fair value of the stock options grant | €         € 352,364   € 232,768        
Unrecognized expense | €             747,043   € 2,652,303    
Share-based payment arrangement, expense | €         352,364   232,768        
Share-based compensation | €         424,360   € 232,768        
Share-based compensation expense | €         € 71,995            
Exercise price | € / shares         € 3.83     € 2.87      
Options granted         495,507   0 587,650      
Weighted average number of shares outstanding, basic         18,767,859   18,256,622        
Weighted average number of shares outstanding, diluted         18,767,859   18,256,622        
Ordinary shares, par value | € / shares           € 0   € 0 € 0    
Officers and Employee [Member]                      
Shares purchased for award 495,507   587,650                
Share-based compensation arrangement by share-based payment award, terms of award For the Chairman and CEO, the NSOs vest monthly over three (3) years and have a 10-year term. For the other two directors of the Company, the NSOs vest monthly over one (1) year, also with a 10-year term. The NSOs granted to officers and employees also have a 10-year term and vest monthly over three (3) years, except for employees with less than one (1) year of service, whose options include a one-year cliff vesting from the date of hire, followed by monthly vesting thereafter.   The directors’ NSOs vest immediately with a 10-year term. The officer and employee NSOs have a 10-year term and vest monthly over a three (3) year period, except that employees with less than one year of service have a one-year cliff vesting from the date of hire, and then monthly vesting thereafter. All options have an exercise price utilizing the stock price at the date of grant of $3.083 per share.