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Accounting Principles - Fair value measurement (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Principles      
Financial assets € 120,417,000 € 39,545,000 € 59,612,000
Financial liabilities 20,177,000 9,594,000 10,575,000
Long term deposit accounts      
Accounting Principles      
Financial assets 1,698,000 792,000  
Financial assets at fair value through profit or loss      
Accounting Principles      
Financial assets 1,791,000    
At fair value      
Accounting Principles      
Financial assets   0 0
Financial liabilities   € 0 € 0
Level 2 | At fair value      
Accounting Principles      
Financial assets 1,791,000    
Level 2 | At fair value | Financial assets at fair value through profit or loss | Foreign currency forwards      
Accounting Principles      
Financial assets € 1,791,000