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Note 15 - Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 25, 2021 | Dec. 26, 2020
Foreign currency translation adjustments, before tax | $ (17,991) | $ (22,859) | $ 27,321
Foreign currency translation adjustments, tax | 41 | (97) | 0
Foreign currency translation adjustments, net of tax | (17,950) | (22,956) | 27,321
Adjustments related to postretirement benefits, before tax | 6,690 | 2,920 | 2,599
Adjustments related to postretirement benefits, tax | (796) | (318) | (216)
Adjustments related to postretirement benefits, net of tax | 5,894 | 2,602 | 2,383
Other comprehensive income (loss), before tax | (11,995) | (22,521) | 29,920
Other comprehensive income (loss), tax | (755) | (415) | (216)
Other comprehensive income (loss), net of tax | (12,750) | (22,936) | 29,704
Change in unrealized gain/loss on investments, before tax | (694) | (67) |
Change in unrealized gain/loss on investments, tax | 0 | 0 |
Change in unrealized gain/loss on investments, net of tax | (694) | (67) | 0
Reclassification due to sale of PBC Test Business, before tax |  | (2,515) |
Reclassification due to sale of PBC Test Business, tax |  | 0 |
Reclassification due to sale of PBC Test Business, net of tax | 0 | (2,515) | 0
Foreign currency translation adjustments, before tax | $ (17,991) | $ (22,859) | $ 27,321

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