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Retirement Benefit Plans (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 28, 2025
Jun. 29, 2024
Jun. 28, 2025
Jun. 29, 2024
Pension Benefit [Member]        
Service cost $ 184,287 $ 178,004 $ 361,749 $ 356,007
Interest cost 987,679 966,704 1,938,776 1,933,406
Expected return on plan assets (1,100,704) (1,099,034) (2,160,640) (2,198,069)
Amortization of prior service cost 0 0 0 0
Amortization of the net loss 301,791 327,363 592,406 654,728
Net periodic benefit cost 373,053 373,037 732,291 746,072
Other Postretirement Benefit [Member]        
Service cost 2,206 3,574 4,331 7,148
Interest cost 12,132 12,951 23,815 25,902
Expected return on plan assets (4,963) (4,684) (9,743) (9,368)
Amortization of prior service cost (864) 1,060 (1,696) 2,120
Amortization of the net loss (23,982) (19,567) (47,075) (39,134)
Net periodic benefit cost $ (15,471) $ (6,666) $ (30,368) $ (13,332)