Note 1 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Apr. 01, 2023

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	April 1,		December 31,
	2023		2022
Raw materials and purchased parts	$	106,585	$	106,041
Work in process		40,814		36,024
Finished goods		28,790		28,076
Total inventories	$	176,189	$	170,141

Property, Plant and Equipment [Table Text Block]

	April 1,			December 31,
	2023			2022
Land and land improvements	$	7,252		$	7,066
Buildings and building improvements		33,441			31,161
Machinery and equipment		106,262			105,109
		146,955			143,336
Less accumulated depreciation and amortization		(79,747	)		(78,325	)
Property, plant and equipment, net	$	67,208		$	65,011

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

	Three Months Ended
	April 1,			March 26,
	2023			2022
Cost of sales	$	180		$	145
Research and development		866			752
Selling, general and administrative		2,868			2,525
Total share-based compensation		3,914			3,422
Income tax benefit		(2,776	)		(1,626	)
Total share-based compensation, net	$	1,138		$	1,796

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

	Three Months Ended
	April 1,		March 26,
	2023		2022
Weighted average common shares		47,343		48,778
Effect of dilutive securities		828		791
		48,171		49,569

Disaggregation of Revenue [Table Text Block]

	Three Months Ended
Disaggregated Net Sales	April 1, 2023		March 26, 2022
Systems	$	102,984	$	117,349
Non-systems		76,387		80,408
Total net sales	$	179,371	$	197,757

	Three Months Ended
Disaggregated Net Sales	April 1, 2023		March 26, 2022
Malaysia	$	31,895	$	20,116
Philippines		31,790		24,385
China		21,110		38,653
United States		18,743		23,763
Taiwan		8,317		19,808
Rest of the World		67,516		71,032
Total net sales	$	179,371	$	197,757

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

	Three Months Ended
	April 1,			March 26,
	2023			2022
Customers individually accounting for more than 10% of net sales	two			one
Percentage of net sales		24	%		11	%