Issued Shares
| Concept | 
                                    
                                        As at 2023-11-14  | 
                            
                                
                                    
                                        As at 2023-11-14  | 
                            
                                
                                    
                                        As at 2023-11-14  | 
                            
                        
|---|---|---|---|
| Issued shares | |||
| Issued shares | |||
| Class | 
                                        
                                             
                                                普通株式
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                A種優先株式
                                                
                                             
                                        
                                     | 
                                
                                    — | 
| Number of issued shares as of fiscal year end | 
                                        
                                             
                                                3,413,300
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                100,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                3,513,300
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Number of issued shares as of filing date | 
                                        
                                             
                                                3,413,300
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                100,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                3,513,300
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Name of financial instruments exchange on which securities are listed or authorized financial instruments business association to which securities are registered | 
                                        
                                             
                                                東京証券取引所
スタンダード市場
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                非上場
                                                
                                             
                                        
                                     | 
                                
                                    — | 
| Description | 
                                        
                                             
                                                単元株式数
100株
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                単元株式数
1株(注)2
                                                
                                             
                                        
                                     | 
                                
                                    — |