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Note 9 - Stock-based Compensation (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 02, 2021 | Apr. 03, 2021 | Sep. 26, 2020 | Mar. 28, 2020 | Oct. 02, 2021 | Sep. 26, 2020
Share-based Payment Arrangement, Expense | $ 10,250 |  | $ 10,488 |  | $ 32,624 | $ 30,228
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] | Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Market Conditions |  | 200.00% |  |  |  |
Awards with Market Condition or Performance Condition [Member] |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 4,000 |  | $ 5,600 |  | $ 15,300 | $ 16,500
Share-based Payment Arrangement, Tranche Two [Member] | Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Market Conditions | 250.00% | 200.00% |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 33.30% |  |  |  |  |
Share-based Payment Arrangement, Tranche Two [Member] | 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 |  | 55.00% |  |  |  |
Share-based Payment Arrangement, Tranche Three [Member] | Performance Shares [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 |  |  |  |  | 33.30% |
Share-based Payment Arrangement, Tranche Three [Member] | Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 0.00% |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Of Market Condition Achieved |  | 25.00% |  |  |  |
Share-based Payment Arrangement, Tranche Three [Member] | Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] | Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Of Market Condition Achieved |  | 25.00% |  |  |  |
Share-based Payment Arrangement, Tranche Three [Member] | Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] | Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Of Market Condition Achieved |  | 75.00% |  |  |  |
TSR Relative To PHLX Semiconductor Sector Index, 75th Percentile [Member] | Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] | Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Market Conditions |  | 250.00% |  |  |  |
TSR Relative To PHLX Semiconductor Sector Index, 75th Percentile [Member] | 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% |  |  |  |
Share-based Payment Arrangement, Tranche One [Member] | 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% |  |  |  |
TSR Relative To PHLX Semiconductor Sector Index, 55th Percentile [Member] | Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Market Conditions |  | 100.00% |  |  |  |

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