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%