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Note 15 - Subsequent Event (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 26, 2020 | Mar. 28, 2020 | Jun. 29, 2019 | Mar. 30, 2019 | Mar. 28, 2020 | Mar. 30, 2019
Operating Income (Loss), Total |  | $ 10,982 | $ 39,000 | $ 24,771 | $ 32,685 | $ 46,853
Cash, Cash Equivalents, and Marketable Securities |  | $ 267,000 |  |  | $ 267,000 |
Subsequent Event [Member] |  |  |  |  |  |
Decrease in Revenue from Contract with Customer, Percentage | 45.00% |  |  |  |  |

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