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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

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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. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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