Disclosure Of Interests In Other Entities [Text Block]
| Concept | 2021-01-01 to 2021-12-31 | 2021-01-01 to 2021-12-31 | 2021-01-01 to 2021-12-31 | As at 2021-12-31 | 2021-01-01 to 2021-12-31 | 2021-01-01 to 2021-12-31 | 2021-01-01 to 2021-12-31 | 2021-01-01 to 2021-12-31 | 2021-01-01 to 2021-12-31 | 2021-01-01 to 2021-12-31 | 2020-01-01 to 2020-12-31 | 2020-01-01 to 2020-12-31 | 2020-01-01 to 2020-12-31 | 2020-01-01 to 2020-12-31 | As at 2020-12-31 | 2020-01-01 to 2020-12-31 | 2020-01-01 to 2020-12-31 | 2020-01-01 to 2020-12-31 | 2020-01-01 to 2020-12-31 | 2020-01-01 to 2020-12-31 | As at 2019-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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] | |||||||||||||||||||||
| Profit (loss), attributable to non-controlling interests | — | — | — | — | — | — | — | — | 
                                                6,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
                                                49,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
| Non-controlling interests | — | — | — | 
                                                132,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                130,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Current assets | — | — | — | 
                                                4 570
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                2 006
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Non-current assets | — | — | — | 
                                                7 155
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                3 056
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Current liabilities | — | — | — | 
                                                907,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                1 564
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Non-current liabilities | — | — | — | 
                                                251,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                355,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Revenue | — | — | — | — | — | — | — | — | 
                                                4 276
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
                                                4 250
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
| Profit (loss) | 
                                                6,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                8 230
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                8 224
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                8 230
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                177,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                128,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                49,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                128,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
| Comprehensive income | 
                                                2,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                6,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                8 928
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                26,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                678,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                8 930
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                8 230
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                98,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                128,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                235,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                1,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                30,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                40,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                138,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
| Disclosure of interests in associates [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of associates [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of associates [abstract] | |||||||||||||||||||||
| Disclosure of associates [line items] | |||||||||||||||||||||
| Other comprehensive income | 
                                                8,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                6,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                698,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                26,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                678,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                706,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                275,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                235,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                1,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                30,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                9,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                266,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
| 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 | — | — | — | 
                                                3 892
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                862,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | 
                                                412,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
| Depreciation and amortisation expense | — | — | — | — | — | — | — | — | 
                                                109,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
                                                89,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
| Tax expense (income) | — | — | — | — | — | — | — | — | 
                                                1 186
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — |