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Operating expenses - Disclosure of principal audit fees and services (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Expenses by nature [abstract]      
Statutory Auditor, certification of individual and consolidated financial statements € 1,714 € 100 € 80
Other procedures required by law 492 740 86
Total € 2,206 € 840 € 166