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Cash and Cash Equivalents (Schedule of Cash and Cash Equivalents) (Details) - EUR (€)
€ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash and cash equivalents [abstract]        
Cash € 24,948 € 35,984    
On call deposits 19,561 898    
Cash and cash equivalents € 44,509 € 36,882 € 23,962 € 22,486