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Note 11 - Stock-based Compensation - Schedule of Allocation of Recognized Period Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2025 | Sep. 29, 2024 | Sep. 28, 2025 | Sep. 29, 2024
Total costs and expenses | $ 828 | $ 1,310 | $ 2,607 | $ 3,535
Cost of Sales [Member] |  |  |  |
Total costs and expenses | 231 | 237 | 578 | 675
Research and Development Expense [Member] |  |  |  |
Total costs and expenses | 96 | 428 | 443 | 729
Selling, General and Administrative Expenses [Member] |  |  |  |
Total costs and expenses | $ 501 | $ 645 | $ 1,586 | $ 2,131

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