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Note 10 - Stock-Based Compensation Plans - Stock-based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 02, 2021 | Dec. 28, 2019 | Dec. 31, 2018
Total stock-based compensation | $ 40,372 | $ 18,899 | $ 13,646
Cost of Sales [Member] |  |  |
Total stock-based compensation | 3,179 | 1,422 | 940
Research and Development Expense [Member] |  |  |
Total stock-based compensation | 10,124 | 5,640 | 4,357
Selling, General and Administrative Expenses [Member] |  |  |
Total stock-based compensation | $ 27,069 | $ 11,837 | $ 8,349

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