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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)

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