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Lease liabilities and commitment (Details) - EUR (€)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Lease liabilities and commitment (Details) [Line Items]    
Cash outflow for leases € 86,196 € 56,996
Bottom of Range [Member]    
Lease liabilities and commitment (Details) [Line Items]    
Lease terms 2 years  
Top of Range [Member]    
Lease liabilities and commitment (Details) [Line Items]    
Lease terms 6 years