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Note 9 - Stock-based Compensation (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 26, 2020 | Jun. 27, 2020 | Mar. 28, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019
Share-based Payment Arrangement, Expense | $ 10,488 |  |  | $ 5,680 | $ 30,228 | $ 13,335
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  | $ 1,800 |  |  |
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 5,600 |  |  | $ 900 | $ 16,500 | $ 2,900
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 3 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Of Grants Tested Each Year |  |  | 50.00% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Of Market Condition Achieved |  |  | 75.00% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Percentage |  | 33.30% |  |  |  |
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% |  |  |
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] | Share-based Payment Arrangement, Tranche One [Member] | Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Market Conditions | 250.00% |  | 250.00% |  |  |
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] | Share-based Payment Arrangement, Tranche One [Member] | Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Market Conditions | 200.00% |  | 200.00% |  |  |
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 Of Market Condition Achieved |  |  | 55.00% |  |  |
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 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% |  |  |

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- Definition The yearly percentage of grants tested for award vesting rights under share based payment arrangement. + References No definition available. + Details
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- Definition The percentage of market condition achieved for awards to vest under share based payment arrangement. + References No definition available. + Details
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