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Other Non-Current Assets (Details) - EUR (€)
€ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other Non-Current Assets      
Advances to suppliers - non-current € 895 € 689  
Longterm deposit accounts 700 1,745 € 1,698
Accrued income 65    
Security deposits 8 8 8
Other noncurrent assets € 1,668 € 2,442 € 1,706