Treasury Shares, Etc.
| Concept | 
                                    
                                        As at 2025-03-20  | 
                            
                                
                                    
                                        As at 2025-03-20  | 
                            
                        
|---|---|---|
| Treasury shares, etc. | ||
| Treasury shares, etc. | ||
| Name of shareholder | — | 
                                        
                                             
                                                石塚硝子株式会社(自己株式)
                                                
                                             
                                        
                                     | 
                                
                            
| Address of shareholder | — | 
                                        
                                             
                                                愛知県岩倉市川井町1880番地
                                                
                                             
                                        
                                     | 
                                
                            
| Number of shares held in own name | 
                                        
                                             
                                                34,900
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                34,900
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Number of shares held in others' names | 
                                        
                                             
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Total number of shares held | 
                                        
                                             
                                                34,900
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                34,900
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Shareholding ratio | 
                                        
                                             
                                                0.0082
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0082
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     |