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Cash and Cash Equivalents (Schedule of Cash and Cash Equivalents) (Details) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash and cash equivalents [abstract]        
Cash € 37,887 € 24,948    
On call deposits 28,958 19,561    
Cash and cash equivalents € 66,845 € 44,509 € 36,882 € 23,962