Notes - Consolidated Statement Of Income
| Concept | 
                                    
                                        2024-01-01 to 2024-12-31  | 
                            
                                
                                    
                                        2024-01-01 to 2024-12-31  | 
                            
                                
                                    
                                        2023-01-01 to 2023-12-31  | 
                            
                        
|---|---|---|---|
| Notes - Consolidated statement of income | |||
| Notes - Consolidated statement of income | |||
| Notes regarding write-downs of inventories | — | — | |
| Write-downs of inventories | 
                                        
                                             
                                                19,691,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                -28,105,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Major components of selling, general and administrative expenses | — |