Retirement Benefit Plans (Details) - USD ($) |
3 Months Ended | |
|---|---|---|
Apr. 04, 2026 |
Mar. 29, 2025 |
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| Pension Benefit [Member] | ||
| Service cost | $ 181,207 | $ 177,462 |
| Interest cost | 876,829 | 951,097 |
| Expected return on plan assets | (1,107,068) | (1,059,936) |
| Amortization of the net loss | 298,781 | 290,615 |
| Net periodic benefit cost | 249,749 | 359,238 |
| Other Postretirement Benefit [Member] | ||
| Service cost | 1,641 | 2,125 |
| Interest cost | 10,394 | 11,683 |
| Expected return on plan assets | (5,000) | (4,780) |
| Amortization of prior service cost | (848) | (832) |
| Amortization of the net loss | (24,497) | (23,093) |
| Net periodic benefit cost | $ (18,310) | $ (14,897) |
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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