Note 11 - Segment and Geographic Information - Summary of Current Segments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Net sales		$ 636,322	$ 812,775	$ 887,214
Profit (loss) for reportable segments				141,933
Gain (Loss) on Disposition of Business	[1]	(0)	(0)	70,815
Interest expense		(3,382)	(4,177)	(6,413)
Interest income		11,504	4,012	239
Gain (Loss) on Extinguishment of Debt		(369)	(312)	(3,411)
Profit (loss) from continuing operations before taxes		45,816	126,715	192,344
Total depreciation and amortization		49,744	46,016	48,568
Capital expenditures		$ 16,053	$ 14,770	12,000
Corporate, Non-Segment [Member]
Corporate expenses				(10,819)
Semiconductor Test and Inspection [Member]
Net sales				860,454
Profit (loss) for reportable segments				138,026
Total depreciation and amortization				48,129
Capital expenditures				11,954
PCB Test [Member]
Net sales				26,760
Profit (loss) for reportable segments				3,907
Total depreciation and amortization				439
Capital expenditures				$ 46

[1] On June 24, 2021 we completed the divestment of our PCB Test business. The divestment of this business did not qualify for presentation as discontinued operations and the results of the PCB Test business are included in continuing operations for all periods presented. See Note 14, “Business Divestitures and Discontinued Operations” for additional information on this transaction and financial statement presentation.