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Income taxes - Taxes recognized through profit or loss (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income taxes      
Current tax expenses € (74) € (158) € (87)
Current year (58) (1) (87)
Adjustments for prior periods (16) (157)  
Deferred tax (expense)/income (207)   397
Temporary differences (182) (514) 527
Tax losses (25) 514 (130)
Income tax (expenses)/ benefit (281) (158) 310
Income taxes recognized directly in other comprehensive income € 0 € 0 € 0