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 | 
                                        
                                             
                                                株式会社肥後銀行
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                瀬口 瑞恵
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                瀬口 力
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                井手尾 環
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                株式会社CSホールディングス
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                小田 将義
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                株式会社日本カストディ銀行(信託口)
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                瀬口 悦子
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                酒巻 英雄
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                Lib Work従業員持株会
                                                
                                             
                                        
                                     | 
                                
                            
| Address | 
                                        
                                             
                                                熊本市中央区練兵町1番地
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                熊本県山鹿市
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                熊本県山鹿市
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                熊本市東区
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                熊本県山鹿市鍋田174番地
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                福岡市中央区
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                東京都中央区晴海1丁目8番12号
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                熊本県山鹿市
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                千葉県流山市
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                熊本県山鹿市鍋田178番地1
                                                
                                             
                                        
                                     | 
                                
                            
| Number of shares held | 
                                        
                                             
                                                139,600
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                640,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                2,679,900
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                400,200
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                8,086,040
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                14,878,057
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                125,200
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                325,400
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1,957,317
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                170,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                354,400
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Shareholding ratio (excluding treasury shares) | 
                                        
                                             
                                                0.0059
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0272
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.1138
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0170
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.3433
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.6316
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0053
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0138
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0831
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0072
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0150
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     |