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10. Employee Benefits (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Employee Benefits      
Wages and salaries € 11,587 € 10,027 € 7,475
Social security costs 1,620 1,092 931
Employee benefits € 13,207 € 11,119 € 8,406