Note 2 - Business Acquisition, Goodwill and Purchased Intangible Assets - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Mar. 30, 2024	Dec. 30, 2023	[1]	Oct. 02, 2023	Dec. 31, 2022
Goodwill	$ 238,322	$ 241,658			$ 213,539
Equiptest Engineering Pte Ltd. (“EQT”) [Member]
Current assets, including cash received				$ 10,135
Property, plant and equipment				538
Intangible assets				34,500
Goodwill				15,377
Total assets acquired				60,550
Liabilities assumed				(10,203)
Net assets acquired				$ 50,347

[1] Derived from December 30, 2023 audited financial statements