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Inventories (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Inventories      
Raw materials, consumables and supplies € 11,167 € 1,644  
Finished goods and merchandise 238 165  
Inventories 11,405 1,809  
Raw materials, consumables and changes in inventories of finished goods and work in process recorded as expenses € 41,594 € 11,285 € 9,473