Statement Of Comprehensive Income [Abstract]
| Concept | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||
| Profit (loss) | — | 
                                                71 879
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                71 879
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                125 774
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                125 774
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
| Other comprehensive income [abstract] | ||||||||||
| Other comprehensive income | — | 
                                                141,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
                                                602,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Comprehensive income | 
                                                -
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                71 828
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                51,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                71 879
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                125 680
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                125 774
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                94,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Comprehensive income attributable to [abstract] | ||||||||||
| Comprehensive income, attributable to owners of parent | — | 
                                                72 020
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
                                                126 376
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — |