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Note 9 - Stock-based Compensation (Details Textual) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 03, 2021 | Mar. 28, 2020
Share-based Payment Arrangement, Expense | $ 10,454 | $ 8,728
Restricted Stock Units (RSUs) [Member] |  |
Share-based Payment Arrangement, Expense |  | 1,800
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 3 years |
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Of Market Condition Achieved | 75.00% |
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Of Market Condition Achieved | 75.00% |
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] | TSR Relative To PHLX Semiconductor Sector Index, 55th Percentile [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Market Conditions | 100.00% |
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Market Conditions | 200.00% |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Of Market Condition Achieved | 55.00% |
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] | Share-based Payment Arrangement, Tranche Three [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Of Market Condition Achieved | 25.00% |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 0.00% |
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] | Minimum [Member] | TSR Relative To PHLX Semiconductor Sector Index, 75th Percentile [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Market Conditions | 250.00% |
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] | Minimum [Member] | Share-based Payment Arrangement, Tranche Three [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Of Market Condition Achieved | 25.00% |
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] | Maximum [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Market Conditions | 200.00% |
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] | Maximum [Member] | TSR Relative To PHLX Semiconductor Sector Index, 75th Percentile [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Market Conditions | 200.00% |
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] | Maximum [Member] | Share-based Payment Arrangement, Tranche Three [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Of Market Condition Achieved | 75.00% |
Performance Shares [Member] | Executive Officer [Member] |  |
Share-based Payment Arrangement, Expense | $ 4,600 | $ 4,200

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