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Note 9 - Stock-Based Compensation - Stock-based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 28, 2020 | Mar. 30, 2019
Total stock-based compensation | $ 8,728 | $ 3,686
Cost of Sales [Member] |  |
Total stock-based compensation | 591 | 202
Research and Development Expense [Member] |  |
Total stock-based compensation | 2,594 | 1,125
Selling, General and Administrative Expenses [Member] |  |
Total stock-based compensation | $ 5,543 | $ 2,359

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