Note 6 - Restructuring (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended	15 Months Ended	34 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Dec. 28, 2019	Mar. 28, 2020	Mar. 28, 2020
Restructuring Charges, Total	$ 940	$ 1,341		$ 940
Q1 2020 Plan [Member]
Restructuring and Related Costs, Incurred Cost, Total	1,100
Q2 2019 Sales Plan [Member]
Restructuring and Related Costs, Incurred Cost, Total	1,800		$ 2,000
Restructuring Charges, Total	(200)
June 2017 Plan [Member]
Restructuring and Related Costs, Incurred Cost, Total	100		$ 1,300		$ 19,100
June 2017 Plan [Member] | Minimum [Member]
Restructuring and Related Cost, Expected Cost, Total	20,000			20,000	20,000
June 2017 Plan [Member] | Maximum [Member]
Restructuring and Related Cost, Expected Cost, Total	$ 21,500			$ 21,500	$ 21,500