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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) at beginning of period € 629 € 610 € 693
Service cost 115 109 143
Interest cost 22 23 8
Benefits paid (41)    
Actuarial gains and losses 31 (112) (235)
Net defined benefit liability (asset) at end of period € 756 € 629 € 610