Statement Of Changes In Equity [Abstract]
| Concept | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | As at 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | 2022-01-01 to 2022-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||
| Equity | — | 
                                                6,861,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                32,550,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                37,057,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                2,354,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                8,230,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                37,057,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                31,181,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                2,354,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                4,364,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                924,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                4,233,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1,055,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Changes in equity [abstract] | ||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||
| Other comprehensive income | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Issue of equity | — | — | — | — | — | — | — | — | — | 
                                                1,299,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                34,123,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                32,824,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Increase (decrease) in equity | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                1,299,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                34,123,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                32,824,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — |