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Income tax - Components of Income tax expense (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income tax      
Current tax € 424 € 880 € 11,463
Deferred tax 151 7 (7)
Total tax expense (income) € 575 € 887 € 11,456