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Financial result (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial result      
Interest expense € (2,589) € (1,349) € (1,279)
Interest expense on lease liability (2018: Finance lease obligations) (167) (190) (69)
Long-term debt (1,602) (993) (944)
Expense from revaluation of derivative financial instruments (808) (106)  
Fair value valuation of financial assets (10)   (136)
Other (2) (60) (130)
Interest income 184 318 2,158
Payout of bond funds 78 126 58
Income from revaluation of derivative financial instruments 93   2,065
Fair value valuation of financial assets   174 18
Other 13 18 17
Financial result € (2,405) € (1,031) € 879