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Investee Companies and other investments (Schedule of Changes in Investments) (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Changes In Equity And Loans [Abstract] |  |  |
Balance as at January 1 | € 34,029 | € 32,234 |
Long term loans extended | 128 | 335 |
Repayment of long term loans | (149) | (2,259) |
Interest On Long Term Loans | (270) | (22) |
Company's share of income of investee | 1,206 | 117 | € 1,525
Foreign currency translation adjustments | (2,250) | 3,624 |
Conversion to short term loan | (2,665) | 0 |
Balance as at December 31 | € 30,029 | € 34,029 | € 32,234

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