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Segment reporting (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment reporting (Details) [Line Items]      
Total revenues € 8,208    
Customer One [Member]      
Segment reporting (Details) [Line Items]      
Total revenues € 7,145    
Customer one [Member]      
Segment reporting (Details) [Line Items]      
Total revenues   € 18,480 € 41,041