Note 1 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022	Jul. 01, 2023	Jun. 25, 2022
Net sales	$ 168,921	$ 217,226	$ 348,292	$ 414,983
PHILIPPINES
Net sales	25,359	21,562	57,149	45,947
Malaysia [Member]
Net sales	23,258	28,857	55,153	48,973
CHINA
Net sales	28,394	46,585	49,504	85,238
UNITED STATES
Net sales	15,750	19,553	34,493	43,316
Rest of the World [Member]
Net sales	76,160	100,669	151,993	191,509
Systems [Member]
Net sales	87,312	131,951	190,296	249,300
Non-systems [Member]
Net sales	$ 81,609	$ 85,275	$ 157,996	$ 165,683