Note 1 - Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 25, 2022

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	June 25,		December 25,
	2022		2021
Raw materials and purchased parts	$	93,648	$	92,798
Work in process		41,760		40,732
Finished goods		27,258		27,523
Total inventories	$	162,666	$	161,053

Property, Plant and Equipment [Table Text Block]

	June 25,			December 25,
	2022			2021
Land and land improvements	$	6,986		$	7,703
Buildings and building improvements		30,578			31,711
Machinery and equipment		98,945			95,542
		136,509			134,956
Less accumulated depreciation and amortization		(74,362	)		(70,999	)
Property, plant and equipment, net	$	62,147		$	63,957

Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Three Months Ended						Six Months Ended
	June 25,			June 26,			June 25,			June 26,
	2022			2021			2022			2021
Cost of sales	$	172		$	191		$	317		$	453
Research and development		826			763			1,578			1,544
Selling, general and administrative		2,935			2,552			5,460			5,032
Total share-based compensation		3,933			3,506			7,355			7,029
Income tax benefit		(836	)		(180	)		(2,462	)		(414	)
Total share-based compensation, net	$	3,097		$	3,326		$	4,893		$	6,615

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended				Six Months Ended
	June 25,		June 26,		June 25,		June 26,
	2022		2021		2022		2021
Weighted average common shares		48,475		48,555		48,626		46,155
Effect of dilutive securities		453		919		622		1,323
		48,928		49,474		49,248		47,478

Disaggregation of Revenue [Table Text Block]

	Three Months Ended				Six Months Ended
Disaggregated Net Sales	June 25, 2022		June 26, 2021		June 25, 2022		June 26, 2021
Systems:
Semiconductor Test & Inspection	$	131,951	$	149,661	$	249,300	$	287,820
PCB Test		-		9,211		-		17,831
Non-systems:
Semiconductor Test & Inspection		85,275		81,464		165,683		155,711
PCB Test		-		4,467		-		8,929
Total net sales	$	217,226	$	244,803	$	414,983	$	470,291

	Three Months Ended				Six Months Ended
Disaggregated Net Sales	June 25, 2022		June 26, 2021		June 25, 2022		June 26, 2021
China	$	46,585	$	57,183	$	85,238	$	111,448
Malaysia		28,857		19,136		48,973		42,395
Philippines		21,562		36,533		45,947		70,287
United States		19,553		21,878		43,316		41,937
Taiwan		15,569		27,190		35,377		59,386
Rest of the World		85,100		82,883		156,132		144,838
Total net sales	$	217,226	$	244,803	$	414,983	$	470,291