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Leases - Income and cash flow (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Leases      
Interest expense on lease liabilities € 190 € 69 € 45
Expenses relating to short-term-leases 39    
Depreciation charge of the year 765    
Lease expense under IAS 17   € (528)  
Cash outflow for leases (397)    
Right-of-use assets      
Leases      
Depreciation charge of the year 765    
Other PPE      
Leases      
Depreciation charge of the year € 148