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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. 27, 2025 | Dec. 28, 2024 | Dec. 30, 2023
Share-based compensation of continuing operations | $ 23,042 | $ 20,740 | $ 17,237
Income tax benefit | 137 | (211) | (1,770)
Total share-based compensation, net of tax | 23,179 | 20,529 | 15,467
Cost of Sales [Member] |  |  |
Share-based compensation of continuing operations | 1,396 | 1,049 | 845
Research and Development Expense [Member] |  |  |
Share-based compensation of continuing operations | 5,456 | 3,566 | 3,394
Selling, General and Administrative Expenses [Member] |  |  |
Share-based compensation of continuing operations | $ 16,190 | $ 16,125 | $ 12,998

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