Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 28, 2019

Notes Tables

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

(in thousands)	2019		2018		2017
Weighted average common shares outstanding		41,159		31,776		27,836
Effect of dilutive stock options and restricted stock units		-		-		1,080
		41,159		31,776		28,916

Schedule of Inventory, Current [Table Text Block]

	December 28,		December 29,
	2019		2018
Raw materials and purchased parts	$	69,665	$	60,112
Work in process		46,591		57,953
Finished goods		14,450		21,249
Total inventories	$	130,706	$	139,314

Property, Plant and Equipment [Table Text Block]

	December 28,			December 29,
	2019			2018
Land and land improvements (1)	$	11,659		$	11,905
Buildings and building improvements (1)		41,474			37,265
Machinery and equipment		61,006			64,791
		114,139			113,961
Less accumulated depreciation and amortization		(43,227	)		(39,629	)
Property, plant and equipment, net	$	70,912		$	74,332

Disaggregation of Revenue [Table Text Block]

	Twelve Months Ended
Disaggregated Net Sales	December 28, 2019		December 29, 2018		December 30, 2017
Systems-Semiconductor Test & Inspection	$	299,473	$	249,514	$	197,454
Non-systems-Semiconductor Test & Inspection		241,405		193,737		155,250
Systems-PCB Test		25,928		6,565		-
Non-systems-PCB Test		16,523		1,952		-
Net sales	$	583,329	$	451,768	$	352,704