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Inventories (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2021
Inventories        
Raw materials, consumables and supplies € 1,801 € 3,831   € 11,167
Finished goods and merchandise 18 38   238
Inventories 1,819 3,869   € 11,405
Raw materials, consumables and changes in inventories of finished goods and work in process recorded as expenses € 19,525 € 9,467 € 11,061