Note 1 - Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 29, 2019

Notes Tables

Reclassification of Amounts on Income Statement [Table Text Block]

Three Months Ended June 30, 2018	As Presented		Amortization of Purchased Intangibles			Foreign Transaction Gains and Losses		As Adjusted
Cost of sales	$	58,316		(639	)		-	$	57,677
SG&A expense	$	16,652		(380	)		3,031	$	19,303

Six Months Ended June 30, 2018	As Presented		Amortization of Purchased Intangibles			Foreign Transaction Gains and Losses		As Adjusted
Cost of sales	$	113,915		(1,315	)		-	$	112,600
SG&A expense	$	34,415		(778	)		1,452	$	35,089

Schedule of Inventory, Current [Table Text Block]

	June 29,		December 29,
	2019		2018
Raw materials and purchased parts	$	68,125	$	60,112
Work in process		52,769		57,953
Finished goods		16,335		21,249
Total inventories	$	137,229	$	139,314

Property, Plant and Equipment [Table Text Block]

	June 29,			December 29,
	2019			2018
Land and land improvements	$	12,182		$	11,905
Buildings and building improvements		39,243			37,265
Machinery and equipment		65,370			64,791
		116,795			113,961
Less accumulated depreciation and amortization		(45,019	)		(39,629	)
Property, plant and equipment, net	$	71,776		$	74,332

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

	Three Months Ended						Six Months Ended
	June 29,			June 30,			June 29,			June 30,
	2019			2018			2019			2018
Cost of sales	$	208		$	162		$	333		$	283
Research and development		776			395			1,414			744
Selling, general and administrative		2,678			1,391			5,608			2,590
Total share-based compensation		3,662			1,948			7,355			3,617
Income tax benefit		(79	)		(126	)		(359	)		(440	)
Total share-based compensation, net	$	3,583		$	1,822		$	6,996		$	3,177

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

	Three Months Ended				Six Months Ended
	June 29,		June 30,		June 29,		June 30,
	2019		2018		2019		2018
Weighted average common shares		41,125		28,893		40,999		28,747
Effect of dilutive securities		-		758		-		844
		41,125		29,651		40,999		29,591

Disaggregation of Revenue [Table Text Block]

	Three Months Ended				Six Months Ended
Net Sales (1)	June 29, 2019		June 30, 2018		June 29, 2019		June 30, 2018
Systems:
Semiconductor Test & Inspection	$	76,155	$	55,663	$	156,095	$	110,568
PCB Test		8,407		N/A		15,379		N/A
Non-systems:
Semiconductor Test & Inspection		61,424		44,154		118,177		84,399
PCB Test		4,025		N/A		8,169		N/A
Total net sales	$	150,011	$	99,817	$	297,820	$	194,967

	Three Months Ended				Six Months Ended
Net Sales	June 29, 2019		June 30, 2018		June 29, 2019		June 30, 2018
China	$	32,738	$	19,140	$	56,289	$	39,383
United States		19,408		15,662		36,509		30,140
Malaysia		16,993		13,048		34,707		24,857
Taiwan		17,202		2,905		32,172		5,846
Philippines		11,395		9,916		25,936		20,462
Rest of the World		52,275		39,146		112,207		74,279
Total net sales	$	150,011	$	99,817	$	297,820	$	194,967

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

Three Months Ended

Six Months Ended

June 29,

June 30,

June 29,

June 30,

2019

2018

2019

2018

Semiconductor Test & Inspection (1)

Customers individually accounting for more than 10% of net sales

one

one

one

one

Percentage of net sales

12

%

11

%

12

%

11

%

PCB Test

Customers individually accounting for more than 10% of net sales

*

N/A

*

N/A

Percentage of net sales

*

N/A

*

N/A