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Other non-current assets (Details) - EUR (€)
€ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other non current assets      
Longterm deposit accounts € 9,000 € 700 € 1,745
Advance payments - non-current 1,047 895 689
Accrued income 0 65 0
Security deposits 8 8 8
Other noncurrent assets € 10,055 € 1,668 € 2,442