Note 8 - Pension and Other Postretirement Benefits - Schedule of Net Periodic Cost of Pension Plans (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jul. 04, 2026 |
Jun. 28, 2025 |
Jul. 04, 2026 |
Jun. 28, 2025 |
|
| Pension Plan [Member] | ||||
| Net service cost | $ 61 | $ 66 | $ 122 | $ 129 |
| Interest cost | 210 | 205 | 421 | 406 |
| Expected return on plan assets | (171) | (174) | (342) | (343) |
| Amortization of actuarial losses (gains) | 0 | 2 | 1 | 5 |
| Net periodic benefit cost | 100 | 99 | 202 | 197 |
| Other Postretirement Benefits Plan [Member] | ||||
| Net service cost | 3 | 3 | 6 | 7 |
| Interest cost | 26 | 28 | 51 | 57 |
| Expected return on plan assets | 0 | 0 | 0 | 0 |
| Amortization of actuarial losses (gains) | (9) | (8) | (19) | (16) |
| Net periodic benefit cost | $ 20 | $ 23 | $ 38 | $ 48 |
| 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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