Statement Of Financial Position [Abstract]
| Concept | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||||||||
| Property, plant and equipment | 
                                                321,843,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                320,979,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Right-of-use assets | 
                                                2,486,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                76,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Investment property | 
                                                15,241,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                14,059,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Goodwill | 
                                                4,329,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                4,329,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Intangible assets other than goodwill | 
                                                2,419,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                2,341,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                1,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Current tax assets | 
                                                183,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                56,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Deferred tax assets | 
                                                68,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                47,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Cash and cash equivalents | 
                                                56,938,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                45,374,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Assets | 
                                                432,419,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                421,695,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Equity and liabilities [abstract] | ||||||||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||||||||
| Issued capital | 
                                                96,808,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                96,808,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Retained earnings | 
                                                149,388,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                142,576,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Share premium | 
                                                31,016,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                31,016,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Other reserves | 
                                                85,070,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                84,815,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Equity attributable to owners of parent | 
                                                382,675,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                379,822,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Non-controlling interests | 
                                                1,124,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                1,405,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Equity | 
                                                383,799,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                4,684,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                149,388,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                80,386,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                1,124,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                31,016,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                96,808,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                20,393,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                382,675,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                381,227,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                4,957,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                79,858,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                1,405,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                31,016,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                142,576,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                96,808,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                24,607,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                379,822,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                118,735,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                79,824,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                5,124,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                10,592,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                350,145,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                347,916,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                31,016,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                2,229,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                16,409,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                107,400,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
| Liabilities [abstract] | ||||||||||||||||||||||||||||||
| Current tax liabilities | 
                                                201,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                67,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Deferred tax liabilities | 
                                                11,539,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                11,063,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Liabilities | 
                                                48,620,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                40,468,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Equity and liabilities | 
                                                432,419,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                421,695,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |