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Note 6 - Employee Benefit Plans - Reported Share-based Compensation in Consolidated Financial Statements (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 25, 2021 | Dec. 26, 2020
Share-based compensation of continuing operations | $ 14,918 | $ 13,792 | $ 14,234
Income tax benefit | (4,004) | (722) | (963)
Total share-based compensation, net of tax | 10,914 | 13,070 | 13,271
Cost of Sales [Member] |  |  |
Share-based compensation of continuing operations | 646 | 828 | 893
Research and Development Expense [Member] |  |  |
Share-based compensation of continuing operations | 3,100 | 3,017 | 3,245
Selling, General and Administrative Expenses [Member] |  |  |
Share-based compensation of continuing operations | $ 11,172 | $ 9,947 | $ 10,096

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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