Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 29, 2018

Notes Tables

Reclassification of Amounts on Income Statement [Table Text Block]

	As Presented		Amortization of Purchased Intangibles			Foreign Transaction Gains and (Losses)			As Adjusted
2017
Cost of Sales	$	211,986		(2,689	)		-		$	209,297
SG&A Expense	$	65,233		(1,519	)		(2,977	)	$	60,737
2016
Cost of Sales	$	187,256		(5,170	)		-		$	182,086
SG&A Expense	$	54,322		(1,732	)		2,622		$	55,212

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

(in thousands)	2018		2017		2016
Weighted average common shares outstanding		31,776		27,836		26,659
Effect of dilutive stock options and restricted stock units		-		1,080		821
		31,776		28,916		27,480

Schedule of Inventory, Current [Table Text Block]

	December 29,		December 30,
	2018		2017
Raw materials and purchased parts	$	60,112	$	27,918
Work in process		57,953		25,130
Finished goods		21,249		9,037
Total inventories	$	139,314	$	62,085

Property, Plant and Equipment [Table Text Block]

	December 29,			December 30,
	2018			2017
Land and land improvements	$	11,905		$	8,017
Buildings and building improvements (1)		37,265			13,779
Machinery and equipment		64,791			45,333
		113,961			67,129
Less accumulated depreciation and amortization		(39,629	)		(32,957	)
Property, plant and equipment, net	$	74,332		$	34,172

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

	Balance at		Adjustments			Balance at
	December 30,		due to adoption			December 31,
Financial Statement Line Item	2017		of ASC 606			2017
Deferred profit	$	6,608	$	(1,258	)	$	5,350
Income taxes payable	$	2,159	$	201		$	2,360
Retained earnings	$	150,726	$	1,057		$	151,783

	For the Twelve Months Ended December 29, 2018
				Balances
				without adoption			Effect of
Consolidated Statements of Operations	As Reported			of ASC 606			Change
Net sales	$	451,768		$	448,797		$	2,971
Income tax provision	$	631		$	92		$	539
Net loss	$	(32,424	)	$	(34,856	)	$	2,432
Income per share:
Basic:	$	(1.02	)	$	(1.10	)	$	0.08
Diluted:	$	(1.02	)	$	(1.10	)	$	0.08

			Balances
			without adoption		Effect of
Consolidated Balance Sheets*	As Reported		of ASC 606		Change
Deferred profit	$	6,896	$	11,125	$	(4,229	)
Retained earnings	$	111,670	$	108,181	$	3,489

Disaggregation of Revenue [Table Text Block]

	Twelve Months Ended
	December 29, 2018		December 30, 2017
Systems-Semiconductor Test & Inspection	$	249,514	$	197,454
Non-systems-Semiconductor Test & Inspection		193,737		155,250
Systems-PCB Test		6,565		-
Non-systems-PCB Test		1,952		-
Net sales	$	451,768	$	352,704