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Summary of significant accounting policies (Details Narrative)
 6 Months Ended 12 Months Ended
Mar. 20, 2025
shares
Jun. 30, 2025
EUR (€)
Integer
shares
Dec. 31, 2024
EUR (€)
shares
Jun. 30, 2024
EUR (€)
shares
Dec. 31, 2023
EUR (€)
shares
Jun. 30, 2025
$ / shares
Jun. 30, 2025
EUR (€)
shares
Jan. 01, 2024
shares
Property, Plant and Equipment [Line Items]                
Net loss | €   € 3,826,585 € 4,873,989 € 4,038,506        
Comprehensive loss | €   3,782,987   € 4,118,875        
Common stock, shares issued     18,289,866 18,289,866 18,216,958   19,146,468  
Common stock, shares outstanding 19,146,468   18,289,866 18,289,866 18,216,958   19,146,468  
Common stock, capital shares reserved for future issuance     900,000 1,800,000 1,800,000   400,000  
Stock issued during period, shares, new issues 856,602              
Share-based compensation arrangement by share-based payment award, options, outstanding, number     970,308   586,923   1,465,815 586,923
Foreign exchange net loss | €   € (602,873)   € 153,791        
Number of operating segments | Integer   1            
Effective income tax rate reconciliation, tax credit, research, amount | €   € 3,300,000            
Share-based compensation arrangement by share-based payment award, expiration period   10 years            
Share-based compensation arrangement by share-based payment award, number of shares available for grant     858,678       448,831 1,234,772
ATM Offering Costs [Member]                
Property, Plant and Equipment [Line Items]                
Offering costs | €       200,000     € 12,918  
Common Stock [Member]                
Property, Plant and Equipment [Line Items]                
Net loss | €            
Stock issued during period, shares, new issues   856,602   72,908        
Number of outstanding common shares     18,289,866 18,289,866 18,216,958   19,146,468  
Maximum [Member]                
Property, Plant and Equipment [Line Items]                
Effective income tax rate reconciliation, tax credit, research, amount | €         € 5,000,000.0      
Maximum [Member] | Common Stock [Member]                
Property, Plant and Equipment [Line Items]                
Share-based compensation arrangement by share-based payment award, options, number of shares, period increase (decrease)   2,700,000            
Share-based compensation arrangement by share-based payment award, number of shares available for grant             2,700,000  
Number of outstanding common shares             27,000,000  
Share-Based Payment Arrangement, Option [Member]                
Property, Plant and Equipment [Line Items]                
Share-based compensation arrangement by share-based payment award, options, outstanding, number       280,033     1,465,815  
Share-Based Payment Arrangement, Option [Member] | Common Stock [Member]                
Property, Plant and Equipment [Line Items]                
Share-based compensation arrangement by share-based payment award, options, outstanding, number             19,146,468  
Share-based compensation arrangement by share-based payment award, number of shares authorized             1,914,646  
Share-based compensation arrangement by share-based payment award, percentage   10.00%            
Underswriters Common Share Warrants [Member]                
Property, Plant and Equipment [Line Items]                
Share-based compensation arrangement by share-based payment award, options, outstanding, number             23,502  
Underswriters Warrants [Member] | IPO [Member]                
Property, Plant and Equipment [Line Items]                
Stock issued during period, shares, new issues   23,502            
Class of warrant or right, exercise price of warrants or rights | $ / shares           $ 14.375    
Equity Incentive Plan 2021 - 2025 [Member]                
Property, Plant and Equipment [Line Items]                
Common stock, capital shares reserved for future issuance     1,800,000