Note 6 - Restructuring (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2022	Apr. 03, 2021
Restructuring Charges, Total	$ 54	$ 176
Q1 2020 Plan [Member]
Restructuring Charges, Total	100	0
Restructuring and Related Cost, Cost Incurred to Date	2,100
June 2017 Plan [Member]
Restructuring and Related Cost, Cost Incurred to Date	21,800
Restructuring and Related Cost, Incurred Cost	200	$ 200
June 2017 Plan [Member] | Minimum [Member]
Restructuring and Related Cost, Expected Cost, Total	22,000
June 2017 Plan [Member] | Maximum [Member]
Restructuring and Related Cost, Expected Cost, Total	$ 23,500