Note 1 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2023	Mar. 26, 2022
Net sales	$ 179,371	$ 197,757
Malaysia [Member]
Net sales	31,895	20,116
PHILIPPINES
Net sales	31,790	24,385
CHINA
Net sales	21,110	38,653
UNITED STATES
Net sales	18,743	23,763
TAIWAN
Net sales	8,317	19,808
Rest of the World [Member]
Net sales	67,516	71,032
Systems [Member]
Net sales	102,984	117,349
Non-systems [Member]
Net sales	$ 76,387	$ 80,408