Issued Shares
| Concept | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | 
|---|---|---|---|---|---|---|---|
| Issued shares | |||||||
| Issued shares | |||||||
| Number of shares | 
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                300
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                10,361,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                10,357,200
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                3,500
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Number of voting rights | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                103,572
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                103,572
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
| Description |  |  | — | 
                                                (注)1
                                                
                                             | 
                                                (注)2
                                                
                                             |  |  |