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Cash and cash equivalents (Details) - EUR (€)
€ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash and cash equivalents.        
Cash at bank and on hand € 58,464 € 96,608 € 19,012 € 2,308
Restricted cash at bank € 7,000 € 0 € 0