Notes - Segment Information, Etc.
| Concept | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Notes - Segment information, etc. | ||||||||||||
| Segment information | ||||||||||||
| Disclosure of sales, profit (loss), asset, liability, and other items for each reportable segment | ||||||||||||
| Sales | ||||||||||||
| Revenues from external customers | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,523,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                619,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,523,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                207,118,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                696,945,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,480,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,480,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                152,866,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                748,088,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                579,681,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||
| Depreciation | 
                                                7,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,190,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,446,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,367,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,698,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,871,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,304,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                8,077,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                333,159,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,565,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                325,081,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                303,974,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                542,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,388,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,534,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                47,922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,772,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |