Analysis Of Income And Expense [Abstract]
| Concept | 2023-01-01 to 2023-12-31 | 2022-01-01 to 2022-12-31 | 
|---|---|---|
| Analysis of income and expense [abstract] | ||
| Revenue [abstract] | ||
| Revenue | 
                                                681,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                1 454
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
| Material income and expense [abstract] | ||
| Impairment loss (reversal of impairment loss) on trade receivables [abstract] | ||
| Impairment loss (reversal of impairment loss) recognised in profit or loss, trade receivables | 
                                                9,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                176,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
| Finance income (cost) | 
                                                1 095
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                393,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
| Expenses by nature [abstract] | ||
| Raw materials and consumables used | 
                                                46,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                101,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
| Services expense | 
                                                593,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                687,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
| Classes of employee benefits expense [abstract] | ||
| Employee benefits expense | 
                                                214,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                177,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
| Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract] | ||
| Depreciation and amortisation expense [abstract] | ||
| Depreciation and amortisation expense | 
                                                410,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                413,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
| Other expenses, by nature | 
                                                145,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                389,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
| Disclosure of attribution of expenses by nature to their function [text block] | — | — | 
| Disclosure of attribution of expenses by nature to their function [abstract] | ||
| Disclosure of attribution of expenses by nature to their function [line items] | ||
| 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 | 
                                                84,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                355,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
| Comprehensive income, continuing and discontinued operations [abstract] | ||
| Comprehensive income | 
                                                2 028
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                1 681
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||
| Comprehensive income, attributable to owners of parent | 
                                                1 997
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                1 633
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
| Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract] | ||
| Comprehensive income, attributable to non-controlling interests | 
                                                31,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                48,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             |