Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 26, 2020

Notes Tables

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

(in thousands)	2020		2019		2018
Weighted average common shares outstanding		41,854		41,159		31,776
Effect of dilutive stock options and restricted stock units		-		-		-
		41,854		41,159		31,776

Schedule of Inventory, Current [Table Text Block]

	December 26,		December 28,
	2020		2019
Raw materials and purchased parts	$	83,755	$	69,665
Work in process		44,315		46,591
Finished goods		14,430		14,450
Total inventories	$	142,500	$	130,706

Property, Plant and Equipment [Table Text Block]

	December 26,			December 28,
	2020			2019
Land and land improvements (1)	$	8,141		$	11,659
Buildings and building improvements (1)		41,153			41,474
Machinery and equipment		65,342			61,006
		114,636			114,139
Less accumulated depreciation and amortization		(47,720	)		(43,227	)
Property, plant and equipment, net	$	66,916		$	70,912

Disaggregation of Revenue [Table Text Block]

(in thousands)	2020		2019		2018
Systems-Semiconductor Test & Inspection	$	317,821	$	299,473	$	249,514
Non-systems-Semiconductor Test & Inspection		267,419		241,405		193,737
Systems-PCB Test		33,293		25,928		6,565
Non-systems-PCB Test		17,474		16,523		1,952
Net sales	$	636,007	$	583,329	$	451,768