Disclosure Of Interests In Other Entities [Text Block]
| Concept | 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 | 2023-01-01 to 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 | 2022-01-01 to 2022-12-31 | As at 2021-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|
| Disclosure of interests in other entities [text block] | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of interests in subsidiaries [text block] | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of subsidiaries [text block] | — |  | — | — | — | — | — | — | — | — | — | 
| Disclosure of subsidiaries [abstract] | |||||||||||
| Disclosure of subsidiaries [line items] | |||||||||||
| Current assets | — | — | 
                                                4,955,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                5,419,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
| Non-current assets | — | — | 
                                                4,705,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                5,593,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
| Current liabilities | — | — | 
                                                2,336,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                2,210,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
| Non-current liabilities | — | — | 
                                                463,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                572,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
| Revenue | — | 
                                                2,693,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
                                                3,382,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
| Disclosure of interests in associates [text block] | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of associates [text block] | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of associates [abstract] | |||||||||||
| Disclosure of associates [line items] | |||||||||||
| Other comprehensive income | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Disclosure of interests in joint arrangements [text block] | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of joint ventures [text block] | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of joint ventures [abstract] | |||||||||||
| Disclosure of joint ventures [line items] | |||||||||||
| Cash and cash equivalents | — | — | 
                                                2,669,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                3,378,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                2,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Depreciation and amortisation expense | — | 
                                                899,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
                                                867,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
| Tax expense (income) | — | 
                                                109,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
                                                371,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — |