Disclosure Of Interests In Other Entities [Text Block]
| Concept | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | As at 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 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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] | |||||||||||||
| Current assets | — | — | 
                                                69  442
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                89  899
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Current liabilities | — | — | 
                                                47  420
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                95 857
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Non-current liabilities | — | — | 
                                                17 423
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                14 434
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Revenue | 
                                                350 349
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                473 336
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
| Profit (loss) | 
                                                71 879
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
                                                71 879
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                125 774
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
                                                125 774
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Comprehensive income | 
                                                71 828
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
                                                51,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                71 879
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                125 680
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
                                                125 774
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                94,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
| Disclosure of interests in associates [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of associates [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of associates [abstract] | |||||||||||||
| Disclosure of associates [line items] | |||||||||||||
| Profit (loss) from continuing operations | 
                                                70 510
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                126 794
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
| Profit (loss) from discontinued operations | 
                                                1 369
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                1 020
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
| Other comprehensive income | 
                                                141,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                602,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
| 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 | — | — | 
                                                14 931
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                2 341
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                4 406
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Other current financial liabilities | — | — | 
                                                4 166
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                -
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Other non-current financial liabilities | — | — | 
                                                6  251
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                -
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Depreciation and amortisation expense | 
                                                5 250
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                4 919
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
| Tax expense (income) | 
                                                5 639
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                4 685
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — |