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Investee Companies and other investments (Schedule of Changes in Investments) (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Changes in equity and loans:      
Balance as at January 1 € 28,161 € 30,820  
Repayment of long term loans (370) (4,576)  
Interest and reevaluation in connection with long term loans 782 1,079  
Deferred interest 54 52  
Elimination of interest on loan from related party (868) (1,130)  
The Company's share of income 3,086 2,545 € 1,531
Foreign currency translation adjustments 2,716 (629)  
Balance as at December 31 € 33,561 € 28,161 € 30,820