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Nature of business and history (Details Narrative)
1 Months Ended 6 Months Ended 12 Months Ended
Dec. 20, 2024
USD ($)
shares
Dec. 20, 2024
EUR (€)
shares
Apr. 26, 2024
USD ($)
Mar. 31, 2025
USD ($)
shares
Mar. 31, 2025
EUR (€)
shares
May 31, 2023
EUR (€)
Jun. 30, 2025
USD ($)
Jun. 30, 2025
EUR (€)
Dec. 31, 2024
EUR (€)
Jun. 30, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Proceeds from issuance or sale of equity               € 2,977,061   € 270,885  
Sale of stock, value           € 30,000,000.0          
Stock issued during period, value, new issues               2,977,061   270,885  
Net loss               3,826,585 € 4,873,989 € 4,038,506  
Accumulated deficit               59,882,105 € 56,055,520    
Cash and cash equivalents and marketable securities               € 17,700,000      
Shelf Registration Statement [Member]                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Proceeds from issuance or sale of equity                     € 100,000,000
ATM Sales Agreement [Member]                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Stock issued during period, value, new issues | $     $ 29,696,999                
Common stock, shares outstanding | $     $ 75,000,000.0                
Sales Agreement [Member]                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Proceeds from issuance or sale of equity $ 303,001 € 271,416   $ 3,255,430 € 2,977,061            
Number of shares sold | shares 73,008 73,008   856,602 856,602            
Sale of stock value of share available to be sold | $             $ 26,441,569        
Sale of stock commission percentage 3.00% 3.00%