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Financial liabilities - Interest-bearing loans (Details) - EUR (€)
€ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Financial liabilities    
Total non-current liabilities € 19,594 € 19,647
Total current liabilities 7,477 7,323
Total non-current and current liabilities 27,071 26,970
Total loans    
Financial liabilities    
Total non-current liabilities 768 1,578
Total current liabilities 3,852 3,688
Secured bank loans    
Financial liabilities    
Total non-current liabilities 768 968
Total current liabilities 802 802
Short term deposits pledged as security 1,500 1,500
Bank overdrafts    
Financial liabilities    
Total current liabilities 3,050 2,636
Municipal loans    
Financial liabilities    
Total non-current liabilities   610
Total current liabilities   250
Lease liabilities    
Financial liabilities    
Total non-current liabilities 18,826 18,069
Total current liabilities 3,625 3,635
Total non-current and current liabilities € 22,451 € 21,704