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Note 9 - Stock-based Compensation (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 28, 2020 | Mar. 30, 2019 | Dec. 28, 2019
Share-based Payment Arrangement, Expense | $ 8,728 | $ 3,686 |
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 | $ 4,200 |  | $ 900
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Of Grants Tested Each Year | 33.33% |  |
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 Market Condition Achieved | 75.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 200.00% |  |
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] | Share-based Payment Arrangement, Tranche One [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 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 | 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 | 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 percentage of market condition achieved for awards to vest under share based payment arrangement. + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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