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Retirement Benefit Plans (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 29, 2024
Jul. 01, 2023
Jun. 29, 2024
Jul. 01, 2023
Pension Benefit [Member]        
Service cost $ 178,004 $ 216,153 $ 356,007 $ 432,306
Interest cost 966,704 990,053 1,933,406 1,980,107
Expected return on plan assets (1,099,034) (1,049,014) (2,198,069) (2,098,030)
Amortization of prior service cost 0 0 0 0
Amortization of the net loss 327,363 342,865 654,728 685,730
Net periodic benefit cost 373,037 500,057 746,072 1,000,113
Other Postretirement Benefit [Member]        
Service cost 3,574 6,486 7,148 12,972
Interest cost 12,951 14,533 25,902 29,066
Expected return on plan assets (4,684) (4,849) (9,368) (9,698)
Amortization of prior service cost 1,060 1,060 2,120 2,120
Amortization of the net loss (19,567) (16,895) (39,134) (33,790)
Net periodic benefit cost $ (6,666) $ 335 $ (13,332) $ 670