Disclosure Of Leases [Text Block]
| Concept | 
                                    
                                        As at 2021-12-31  | 
                            
                                
                                    
                                        As at 2020-12-31  | 
                            
                        
|---|---|---|
| Disclosure of leases [text block] | — | — | 
| Presentation of leases for lessee [abstract] | ||
| Lease liabilities [abstract] | ||
| Lease liabilities | 
                                        
                                             
                                                92,405,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                154,481,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             
                                        
                                     |