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Notes to the Balance Sheet - Summary of Cash and Cash Equivalents (Details) - EUR (€)
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract]        
Bank Balances and Cash in Hand € 158,511,000 € 402,353,000    
Impairment (11,000) (2,000)    
Cash and Cash Equivalents € 158,499,651 € 402,350,904 € 123,248,256 € 109,794,680