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Provisions - Disclosure of Commitments for Retirement Benefits (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Provisions [abstract]      
Provisions of retirement benefits at beginning of period € 414 € 331  
Cost of services 84 76 € 76
Interests / discounting costs 1 3  
Expense for the period 85 79  
Gains or losses related to experience (133) (61)  
Gains or losses related to change in demographic assumptions (5) 3  
Gains or losses related to change in financial assumptions (43) 62  
Actuarial gains or losses recognized in other comprehensive income (182) 4  
Provisions of retirement benefits at end of period € 318 € 414 € 331