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Debentures (Schedule of Debentures) (Details) - EUR (€)
€ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Debentures € 71,584 € 51,343
Less current maturities 26,773 8,758
Total long-term debentures 44,811 42,585
Face value    
Disclosure of detailed information about financial instruments [line items]    
Debentures 72,137 52,056
Less current maturities 26,928 8,975
Total long-term debentures 45,209 43,081
Carrying amount [Member]    
Disclosure of detailed information about financial instruments [line items]    
Debentures 71,584 51,343
Less current maturities 26,773 8,758
Total long-term debentures € 44,811 € 42,585