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Related parties (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Related party transactions [abstract]      
Salaries, wages and benefits € 1,245 € 1,073 € 1,306
Share-based payments 2,018 1,723 2,066
Supervisory Board’s fees 375 70 70
Total compensation to related parties € 3,638 € 2,866 € 3,442