Analysis Of Income And Expense [Abstract]
| Concept | 2024-01-01 to 2024-12-31 | 2023-01-01 to 2023-12-31 | 
|---|---|---|
| Analysis of income and expense [abstract] | ||
| Revenue [abstract] | ||
| Revenue | 
                                                156,593,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                153,090,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Material income and expense [abstract] | ||
| Research and development expense | 
                                                1,779,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1,806,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Finance income (cost) | — | — | 
| Other finance income (cost) | 
                                                783,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                549,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract] | ||
| Share of profit (loss) of associates and joint ventures accounted for using equity method | 
                                                1,020,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1,092,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Comprehensive income, continuing and discontinued operations [abstract] | ||
| Comprehensive income | 
                                                11,227,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                16,265,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||
| Comprehensive income, attributable to owners of parent | 
                                                11,227,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                16,265,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             |