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Income taxes - Income Tax (Expense) Benefit (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income taxes      
Deferred tax (expense) € (9) € (11) € (80)
Income tax benefit (expense) € (9) € (11) € (80)