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Income Taxes (Details) - EUR (€)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income Taxes    
U.S. Federal statutory rates on net loss before income taxes € (1,009) € (993)
Effect of foreign statutory rate differences (57) (60)
Effect of exchange rate changes (1,058) (1,089)
Expiration of net operating loss carry forwards 428 217
Permanent differences 0 0
Change in valuation allowance 1,696 1,925
Income tax provision € 0 € 0