Note 6 - Restructuring (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2022	Jul. 03, 2021	Jul. 02, 2022	Jul. 03, 2021
Restructuring Charges, Total	$ 136	$ 204	$ 190	$ 380
Q1 2020 Plan [Member]
Restructuring Charges, Total	0	100	100	100
Restructuring and Related Cost, Cost Incurred to Date	2,100		2,100
June 2017 Plan [Member]
Restructuring and Related Cost, Cost Incurred to Date	21,900		21,900
Restructuring and Related Cost, Incurred Cost	100	$ 200	300	$ 400
June 2017 Plan [Member] | Minimum [Member]
Restructuring and Related Cost, Expected Cost, Total	22,000		22,000
June 2017 Plan [Member] | Maximum [Member]
Restructuring and Related Cost, Expected Cost, Total	$ 23,500		$ 23,500