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Retirement Benefit Plans (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 27, 2025
Sep. 28, 2024
Sep. 27, 2025
Sep. 28, 2024
Pension Benefit [Member]        
Service cost $ 180,873 $ 178,003 $ 542,622 $ 534,010
Interest cost 969,386 966,701 2,908,162 2,900,107
Expected return on plan assets (1,080,317) (1,099,034) (3,240,957) (3,297,103)
Amortization of the net loss 296,204 327,363 888,610 982,091
Net periodic benefit cost 366,146 373,033 1,098,437 1,119,105
Other Postretirement Benefit [Member]        
Service cost 2,125 3,574 6,456 10,722
Interest cost 11,683 12,951 35,498 38,853
Expected return on plan assets (4,780) (4,684) (14,523) (14,052)
Amortization of prior service cost (832) 1,060 (2,528) 3,180
Amortization of the net loss (23,093) (19,567) (70,168) (58,701)
Net periodic benefit cost $ (14,897) $ (6,666) $ (45,265) $ (19,998)