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Note 9 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 27, 2020
Mar. 28, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Share-based Payment Arrangement, Expense $ 11,012   $ 3,969 $ 19,740 $ 7,655
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 $ 6,700   $ 1,100 $ 10,900 $ 2,000
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%      
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%      
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%