Note 9 - Pension and Other Postretirement Benefits (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 27, 2025 |
Sep. 28, 2024 |
Sep. 27, 2025 |
Sep. 28, 2024 |
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| Pension Plan [Member] | ||||
| Net service cost | $ 66 | $ 66 | $ 195 | $ 199 |
| Interest cost | 208 | 191 | 613 | 572 |
| Expected return on plan assets | (176) | (211) | (519) | (630) |
| Amortization of actuarial losses (gains) | 2 | 4 | 7 | 13 |
| Net periodic benefit cost | 100 | 50 | 296 | 154 |
| Other Postretirement Benefits Plan [Member] | ||||
| Net service cost | 3 | 4 | 10 | 12 |
| Interest cost | 28 | 27 | 85 | 81 |
| Expected return on plan assets | 0 | 0 | 0 | 0 |
| Amortization of actuarial losses (gains) | (8) | (3) | (24) | (9) |
| Net periodic benefit cost | $ 23 | $ 28 | $ 71 | $ 84 |
| X | ||||||||||
- 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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| X | ||||||||||
- 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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| X | ||||||||||
- 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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| X | ||||||||||
- 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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| X | ||||||||||
- 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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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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