Disclosure Of Entity's Operating Segments [Text Block]
| Concept | 2024-01-01 to 2024-12-31 | As at 2024-12-31 | 2024-01-01 to 2024-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | 
|---|---|---|---|---|---|---|
| Disclosure of entity's operating segments [text block] | — | — | — | — | — | — | 
| Disclosure of operating segments [text block] | — | — | — | — | — | — | 
| Disclosure of operating segments [abstract] | ||||||
| Disclosure of operating segments [line items] | ||||||
| Revenue | 
                                                350 349
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                473 336
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Depreciation and amortisation expense | 
                                                5 250
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                4 919
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Tax expense (income) | 
                                                5 639
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                4 685
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Profit (loss) before tax | 
                                                76 149
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                131 479
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Profit (loss) from continuing operations | 
                                                70 510
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                126 794
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Profit (loss) | 
                                                71 879
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
                                                71 879
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                125 774
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
                                                125 774
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Assets | — | 
                                                157 011
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                227  051
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
| Cash flows from (used in) operating activities | 
                                                19 546
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                13 495
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Cash flows from (used in) investing activities | 
                                                -
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                3 116
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Cash flows from (used in) financing activities | 
                                                32 236
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                12 223
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Disclosure of products and services [text block] | — | — | — | — | — | — | 
| Disclosure of products and services [abstract] | ||||||
| Disclosure of products and services [line items] | ||||||
| Disclosure of geographical areas [text block] | — | — | — | — | — | — | 
| Disclosure of geographical areas [abstract] | ||||||
| Disclosure of geographical areas [line items] | ||||||
| Disclosure of major customers [text block] | — | — | — | — | — | — | 
| Disclosure of major customers [abstract] | ||||||
| Disclosure of major customers [line items] |