Disclosure Of Income Tax [Text Block]
| Concept | As at 2024-12-31 | 2024-01-01 to 2024-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | 
|---|---|---|---|---|
| Disclosure of income tax [text block] | — | — | — | — | 
| Major components of tax expense (income) [abstract] | ||||
| Tax expense (income) | — | 
                                                23,560
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                27,204
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Income tax relating to components of other comprehensive income [abstract] | ||||
| Income tax relating to remeasurements of defined benefit plans included in other comprehensive income | — | 
                                                713,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                1,250
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Income tax relating to investments in equity instruments included in other comprehensive income | — | 
                                                3,499
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                4,575
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Income tax relating to changes in fair value of financial liability attributable to change in credit risk of liability included in other comprehensive income | — | 
                                                50,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                67,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Income tax relating to financial assets measured at fair value through other comprehensive income included in other comprehensive income | — | 
                                                164,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                464,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Disclosure of temporary difference, unused tax losses and unused tax credits [text block] | — | — | — | — | 
| Disclosure of temporary difference, unused tax losses and unused tax credits [abstract] | ||||
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] | ||||
| Deferred tax assets and liabilities [abstract] | ||||
| Deferred tax assets | 
                                                9,651
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                8,447
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Deferred tax liabilities | 
                                                21,863
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                12,024
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |