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Debentures (Schedule of Debentures) (Details) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Debentures € 82,724 € 71,584
Less current maturities 10,600 26,773
Total long-term debentures 72,124 44,811
Face value    
Disclosure of detailed information about financial instruments [line items]    
Debentures 83,499 72,137
Less current maturities 10,849 26,928
Total long-term debentures 72,650 45,209
Carrying amount [Member]    
Disclosure of detailed information about financial instruments [line items]    
Debentures 82,724 71,584
Less current maturities 10,600 26,773
Total long-term debentures € 72,124 € 44,811