Disclosure Of Cash Flow Statement [Text Block]
| Concept | 
                                    
                                        As at 2024-12-31  | 
                            
                                
                                    
                                        2024-01-01 to 2024-12-31  | 
                            
                                
                                    
                                        As at 2023-12-31  | 
                            
                                
                                    
                                        As at 2022-12-31  | 
                            
                        
|---|---|---|---|---|
| Disclosure of cash flow statement [text block] | — | 
                                        
                                             
                                                Acquisition des immobilisations en flux de trésorerie
                                                
                                             
                                        
                                     | 
                                
                                    — | — | 
| Description of accounting policy for determining components of cash and cash equivalents [text block] | — | 
                                        
                                             
                                                La trésorerie et les équivalents de trésorerie comprennent la trésorerie en banque, la caisse et les dépôts à court terme ayant une échéance initiale d'un à douze mois.
                                                
                                             
                                        
                                     | 
                                
                                    — | — | 
| Cash and cash equivalents if different from statement of financial position [abstract] | ||||
| Cash and cash equivalents | 
                                        
                                             
                                                455 962
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                398 377
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
| Cash and cash equivalents if different from statement of financial position | 
                                        
                                             
                                                442 031
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                320 496
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                306 469
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             
                                        
                                     |