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Other Non-Current Assets (Details) - EUR (€)
€ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other Non-Current Assets      
Accrued income     € 2,000
Longterm deposit accounts € 1,745 € 1,698 792
Security deposits 8 8 8
Tax loss carry back     333
Advances to suppliers - non-current 689    
Other noncurrent assets € 2,442 € 1,706 € 3,135