Disclosure Of Entity's Operating Segments [Text Block]
| Concept | 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 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | — | — | 
                                                3 431 455
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                3 508 706
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Tax expense (income) | — | — | 
                                                51 273
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                59 929
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Profit (loss) before tax | — | — | 
                                                226  670
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                308  997
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Profit (loss) | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                175  397
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
                                                175  397
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                249  068
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                249   068
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Assets | — | — | — | 
                                                3 760 700
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                3 605 539
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Liabilities | — | — | — | 
                                                2  110  184
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                2 075 298
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Cash flows from (used in) operating activities | — | — | 
                                                519 197
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                128 433
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Cash flows from (used in) investing activities | — | — | 
                                                313  278
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                140  012
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Cash flows from (used in) financing activities | — | — | 
                                                69  890
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                169  891
                                                
                                                    
                                                        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] |