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Income taxes - Taxes recognized through profit or loss (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income taxes      
Current tax expenses € (152) € (72) € (16)
Current year (144) (56)  
Adjustments for prior periods (8) (16) (16)
Deferred tax (expense)/income 45 142 (208)
Temporary differences 45 142 (182)
Tax losses     (26)
Income tax (expenses)/ benefit (107) 70 (224)
Income taxes recognized directly in other comprehensive income € 0 € 0 € 0