Profit Or Loss [Abstract]
| Concept | 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 | 
|---|---|---|---|---|
| Profit or loss [abstract] | ||||
| Profit (loss) [abstract] | ||||
| Revenue | 
                                                350 349
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                473 336
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Employee benefits expense | 
                                                159 792
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                243 705
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Depreciation and amortisation expense | 
                                                5 250
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                4 919
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Impairment loss (reversal of impairment loss) recognised in profit or loss | 
                                                50 000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                107 500
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Other expenses, by nature | 
                                                16 716
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                18 516
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Profit (loss) from operating activities | 
                                                72 562
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                127 993
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Profit (loss) before tax | 
                                                76 149
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                131 479
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Tax expense (income) | 
                                                5 639
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                4 685
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Profit (loss) from continuing operations | 
                                                70 510
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                126 794
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Profit (loss) from discontinued operations | 
                                                1 369
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                1 020
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Profit (loss) | 
                                                71 879
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                71 879
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                125 774
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                125 774
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Earnings per share [text block] | — | — | — | — | 
| Earnings per share [abstract] | ||||
| Earnings per share [line items] | ||||
| Basic earnings per share [abstract] | ||||
| Basic earnings (loss) per share from discontinued operations | 
                                                7.00
                                                
                                             | — | — | 
                                                11.00
                                                
                                             | 
| Basic earnings (loss) per share | 
                                                368.00
                                                
                                             | — | — | 
                                                1,394.00
                                                
                                             |