Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 25, 2021

Notes Tables

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

(in thousands)	2021		2020		2019
Weighted average common shares outstanding		47,409		41,854		41,159
Effect of dilutive stock options and restricted stock units		1,051		-		-
		48,460		41,854		41,159

Schedule of Inventory, Current [Table Text Block]

	December 25,		December 26,
	2021		2020
Raw materials and purchased parts	$	92,798	$	83,755
Work in process		40,732		44,315
Finished goods		27,523		14,430
Total inventories	$	161,053	$	142,500

Property, Plant and Equipment [Table Text Block]

	December 25,			December 26,
	2021			2020
Land and land improvements	$	7,703		$	8,141
Buildings and building improvements		31,711			34,439
Machinery and equipment		95,542			88,960
		134,956			131,540
Less accumulated depreciation and amortization		(70,999	)		(64,624	)
Property, plant and equipment, net	$	63,957		$	66,916

Disaggregation of Revenue [Table Text Block]

(in thousands)	2021		2020		2019
Systems-Semiconductor Test & Inspection	$	541,589	$	317,821	$	299,473
Non-systems-Semiconductor Test & Inspection		318,865		267,419		241,405
Systems-PCB Test		17,831		33,293		25,928
Non-systems-PCB Test		8,929		17,474		16,523
Net sales	$	887,214	$	636,007	$	583,329