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Valuation and qualifying accounts (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period € 418 € 658 € 348
Charges to Earnings 640 227 330
Deductions (122) (467) (20)
Balance at End of Period € 936 € 418 € 658