Disclosure Of Borrowing Costs [Text Block]
| Concept | 
                                    
                                        2021-01-01 to 2021-12-31  | 
                            
                                
                                    
                                        2020-01-01 to 2020-12-31  | 
                            
                        
|---|---|---|
| Disclosure of borrowing costs [text block] | — | — | 
| Interest costs [abstract] | ||
| Interest expense | 
                                        
                                             
                                                51,845,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                64,185,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             
                                        
                                     |