Note 8 - Restructuring (Details Textual) - USD ($) $ in Thousands	12 Months Ended				79 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021	Dec. 30, 2023
Restructuring Charges	$ 1,908	$ 2,551	$ 940
Operating Lease, Impairment Loss	0	1,149	$ 0
Q3 2023 Plan [Member]
Restructuring and Related Cost, Incurred Cost	2,000
Restructuring and Related Cost, Cost Incurred to Date	2,000				$ 2,000
Q2 2019 Sales Plan [Member]
Restructuring and Related Cost, Incurred Cost		1,000
Restructuring and Related Cost, Cost Incurred to Date	3,100				3,100
Restructuring Charges	0			$ 0
Q1 2020 Plan [Member]
Restructuring and Related Cost, Incurred Cost	100
June 2017 Plan [Member]
Restructuring and Related Cost, Incurred Cost	$ 700	1,600			$ 23,300
June 2017 Plan [Member] | San Jose [Member]
Operating Lease, Impairment Loss		$ 1,100