Note 1 - Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	September 30,		December 31,
	2023		2022
Raw materials and purchased parts	$	106,466	$	106,041
Work in process		32,738		36,024
Finished goods		27,469		28,076
Total inventories	$	166,673	$	170,141

Property, Plant and Equipment [Table Text Block]

	September 30,			December 31,
	2023			2022
Land and land improvements	$	6,830		$	7,066
Buildings and building improvements		37,272			31,161
Machinery and equipment		107,139			105,109
		151,241			143,336
Less accumulated depreciation and amortization		(84,636	)		(78,325	)
Property, plant and equipment, net	$	66,605		$	65,011

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

	Three Months Ended						Nine Months Ended
	September 30,			September 24,			September 30,			September 24,
	2023			2022			2023			2022
Cost of sales	$	223		$	161		$	619		$	478
Research and development		849			755			2,534			2,333
Selling, general and administrative		3,262			2,824			9,527			8,284
Total share-based compensation		4,334			3,740			12,680			11,095
Income tax benefit		(45	)		(770	)		(2,883	)		(3,232	)
Total share-based compensation, net	$	4,289		$	2,970		$	9,797		$	7,863

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

	Three Months Ended				Nine Months Ended
	September 30,		September 24,		September 30,		September 24,
	2023		2022		2023		2022
Weighted average common shares		47,615		47,984		47,525		48,412
Effect of dilutive securities		492		542		577		596
		48,107		48,526		48,102		49,008

Disaggregation of Revenue [Table Text Block]

	Three Months Ended				Nine Months Ended
Disaggregated Net Sales	September 30, 2023		September 24, 2022		September 30, 2023		September 24, 2022
Systems	$	73,173	$	120,672	$	263,469	$	369,972
Non-systems		77,631		86,015		235,627		251,698
Total net sales	$	150,804	$	206,687	$	499,096	$	621,670

	Three Months Ended				Nine Months Ended
Disaggregated Net Sales	September 30, 2023		September 24, 2022		September 30, 2023		September 24, 2022
Malaysia	$	23,550	$	24,060	$	78,703	$	73,033
Philippines		19,983		38,852		77,132		84,799
China		19,689		31,477		69,193		116,715
United States		23,604		19,510		58,097		62,826
Rest of the World		63,978		92,788		215,971		284,297
Total net sales	$	150,804	$	206,687	$	499,096	$	621,670

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

	Three Months Ended						Nine Months Ended
	September 30,			September 24,			September 30,			September 24,
	2023			2022			2023			2022
Customers individually accounting for more than 10% of net sales	two			one			one				*
Percentage of net sales		22	%		13	%		13	%		*