Major Shareholders
| Concept | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|
| Major shareholders | |||||||||||
| Major shareholders | |||||||||||
| Name | 
                                                北沢 良雄
                                                
                                             | 
                                                (公財)広沢育英会
                                                
                                             | 
                                                廣澤 清
                                                
                                             | 
                                                広沢㈲
                                                
                                             | 
                                                廣澤興産㈲
                                                
                                             | — | 
                                                大山 和次
                                                
                                             | 
                                                井上 拓夫
                                                
                                             | 
                                                広沢 かほる
                                                
                                             | 
                                                大島 勇
                                                
                                             | 
                                                鈴木 祥郎
                                                
                                             | 
| Address | 
                                                千葉県浦安市
                                                
                                             | 
                                                茨城県つくば市寺具1395-1
                                                
                                             | 
                                                茨城県筑西市
                                                
                                             | 
                                                東京都台東区元浅草2-7-13
                                                
                                             | 
                                                東京都台東区元浅草2-7-13
                                                
                                             | — | 
                                                千葉県松戸市
                                                
                                             | 
                                                東京都文京区
                                                
                                             | 
                                                茨城県筑西市
                                                
                                             | 
                                                埼玉県比企郡吉見町
                                                
                                             | 
                                                神奈川県藤沢市
                                                
                                             | 
| Number of shares held | 
                                                14,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                120,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                217,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                100,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                355,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                1,030,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                10,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                24,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                139,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                15,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                34,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Shareholding ratio (excluding treasury shares) | 
                                                0.0093
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0763
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.1380
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0636
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.2258
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.6549
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0067
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0153
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0888
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0095
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0217
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |