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Financial risk management objectives and policies (Details) - EUR (€)
€ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]      
Offset trade receivables and payables € 1,802 € 324  
ECL provision of trade and other receivables (as a percent) 69.00% 36.00%  
Trade notes and accounts receivable      
Disclosure of detailed information about financial instruments [line items]      
Financial assets € 9,497 € 8,065  
Trade notes and accounts receivable | Cost      
Disclosure of detailed information about financial instruments [line items]      
Financial assets 17,780 12,319  
Trade notes and accounts receivable | Accumulated impairment      
Disclosure of detailed information about financial instruments [line items]      
Financial assets (8,283) (4,254) € (3,221)
Other receivables | Cost      
Disclosure of detailed information about financial instruments [line items]      
Financial assets 4,728 3,675  
Other receivables | Accumulated impairment      
Disclosure of detailed information about financial instruments [line items]      
Financial assets € (503) € (484) € (385)