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Investee Companies and other investments (Schedule of Changes in Investments) (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes in equity and loans:      
Balance as at January 1 € 33,561 € 28,161  
Long term loans extended 181  
Repayment of long term loans (2,560) (370)  
Interest and reevaluation in connection with long term loans 758 782  
Deferred interest 56 54  
Elimination of interest on loan from related party (676) (868)  
The Company's share of income 1,525 3,086 € 2,545
Foreign currency translation adjustments (611) 2,716  
Balance as at December 31 € 32,234 € 33,561 € 28,161