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Inventories and contracts in progress (Details) - EUR (€)
€ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Inventories and contracts in progress      
Raw materials € 6,776 € 9,007 € 9,061
Work in progress 4,364 4,237 4,070
Finished goods 3,764 3,158 3,266
Contracts in progress   590 637
Total inventories and contracts in progress € 14,904 € 16,992 € 17,034