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Inventories and contracts in progress - Additional Information (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Inventories and contracts in progress      
Inventory written-off € 918 € 673 € 471
Expenses recorded in cost of sales € 308 € 155 € 51