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Personnel expenses (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Personnel expense      
Wages and salaries € 11,568 € 13,885 € 12,772
Employee stock option plan 671 671 604
Social security contributions 2,289 2,710 2,527
Total employee benefits expense 14,528 17,266 15,903
MetallRente 65 66 61
German state plan      
Personnel expense      
Mandatory employer's contribution € 754 € 889 € 849