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Schedule of marketable securities (Details) - EUR (€)
Jun. 30, 2025
Dec. 31, 2024
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss € 12,422,023 € 7,992,891
Debt Securities, Available-for-Sale, Excluding Accrued Interest 12,491,755 8,078,002
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain (Loss), before Tax 70,169 96,234
Debt Securities, Available-for-Sale, Allowance for Credit Loss
Available-for-Sale Securities [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss 12,422,023 7,992,891
Debt Securities, Available-for-Sale, Excluding Accrued Interest 12,491,755 8,078,002
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain (Loss), before Tax 70,169 96,234
Debt Securities, Available-for-Sale, Allowance for Credit Loss