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Retirement benefit obligations - Disclosure of changes in projected benefit obligation (Details) - RETIREMENT BENEFIT OBLIGATIONS - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) at beginning of period € 756 € 629 € 610
Service cost 141 115 109
Past services cost (205)    
Interest cost 29 22 23
Benefits paid   (41)  
Actuarial gains and losses (93) 31 (112)
Net defined benefit liability (asset) at end of period € 627 € 756 € 629