Disclosure Of Leases [Text Block]
| Concept | 
                                    
                                        As at 2023-12-31  | 
                            
                                
                                    
                                        As at 2022-12-31  | 
                            
                        
|---|---|---|
| Disclosure of leases [text block] | — | — | 
| Presentation of leases for lessee [abstract] | ||
| Right-of-use assets | 
                                        
                                             
                                                35  672
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                45  924
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Lease liabilities [abstract] | ||
| Non-current lease liabilities | 
                                        
                                             
                                                19  80 6
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                30   129
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Disclosure of quantitative information about leases for lessee [abstract] | ||
| Disclosure of quantitative information about right-of-use assets [text block] | — | — | 
| Disclosure of quantitative information about right-of-use assets [abstract] | ||
| Disclosure of quantitative information about right-of-use assets [line items] | ||
| Reconciliation of changes in right-of-use assets [abstract] |