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Schedule of outstanding stock options (Details) - EUR (€)
6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]          
Number of options outstanding, Beginning 970,308   586,923 586,923  
Weighted average exercise price outstanding, Beginning € 3.65   € 4.84 € 4.84  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 8 years 9 months 25 days     8 years 9 months 6 years 6 months 10 days
Aggregate intrinsic value outstanding, Beginning € 706,366   € 67,596 € 67,596  
Number of options, Granted 495,507   0 587,650  
Weighted average exercise price, Granted € 3.83     € 2.87  
Weighted average remaining contractual term (Years), Granted 9 years 11 months 4 days     9 years 6 months  
Aggregate intrinsic value, Granted      
Number of options, Vested and exercised      
Weighted average exercise price, Vested and exercised      
Aggregate intrinsic value, Vested and exercised      
Number of options, Cancelled or forfeited (56,482)   (204,265)  
Weighted average exercise price, Cancelled or forfeited     € 5.94  
Aggregate intrinsic value, Cancelled or forfeited      
Number of options outstanding, Ending 1,465,815 970,308   970,308 586,923
Weighted average exercise price outstanding, Ending € 3.40 € 3.65   € 3.65 € 4.84
Aggregate intrinsic value outstanding,Ending € 634,066 € 706,366   € 706,366 € 67,596
Number of options,Exercisable 662,291 514,210   514,210  
Weighted average exercise price, Exercisable € 3.56 € 4.13   € 4.13  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 7 years 11 months 23 days     8 years 2 months 23 days  
Aggregate intrinsic value, Exercisable € 270,230 € 199,667   € 199,667  
Number of options outstanding, Expected to vest 803,524 456,098   456,098  
Weighted average exercise price outstanding, Expected to vest € 3.27 € 3.10   € 3.10  
Weighted average remaining contractual term (years) Outstanding expected to vest 9 years 6 months 3 days     9 years 3 months 29 days  
Aggregate intrinsic value outstanding, Expected to vest € 363,835 € 506,699   € 506,699