Treasury Shares, Etc.
| Concept | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | 
|---|---|---|---|---|
| Treasury shares, etc. | ||||
| Treasury shares, etc. | ||||
| Name of shareholder | — | 
                                                戸田工業株式会社
                                                
                                             | 
                                                TDK株式会社
                                                
                                             | 
                                                由利工業株式会社
                                                
                                             | 
| Address of shareholder | — | 
                                                広島県広島市南区京橋町
1-23
                                                
                                             | 
                                                東京都中央区日本橋
2-5-1
                                                
                                             | 
                                                秋田県由利本荘市西目町
沼田新道下2-659
                                                
                                             | 
| Number of shares held in own name | 
                                                47,605,100
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                1,350,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                46,225,100
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                30,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Number of shares held in others' names | 
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Total number of shares held | 
                                                47,605,100
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                1,350,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                46,225,100
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                30,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Shareholding ratio | 
                                                0.0245
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0007
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0238
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0000
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |