Note 6 - Segment and Geographic Information (Tables)

9 Months Ended

Sep. 30, 2016

Notes Tables

Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]

	Three Months Ended September 30,						Nine Months Ended September 30,
Customer	2016			2015			2016			2015
Distributor A		22	%		24	%		22	%		24	%

Schedule Of Accounts Receivable, By Major Customers [Table Text Block]

	September 30,			December 31,
Customer	2016			2015
Distributor A		23	%		28	%
Distributor B		13	%		17	%

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
Country or Region	2016		2015		2016		2015
China	$	67,372	$	58,716	$	180,689	$	157,968
Taiwan		12,786		10,352		31,801		31,524
Korea		7,405		6,019		21,522		15,373
Europe		7,193		5,956		21,232		16,388
Southeast Asia		5,370		5,764		13,210		12,839
Japan		4,084		2,633		9,771		6,930
United States		2,164		1,673		6,613		4,932
Other		82		81		209		194
Total	$	106,456	$	91,194	$	285,047	$	246,148

Revenue from External Customers by Products and Services [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
Product Family	2016		2015		2016		2015
DC to DC products	$	95,615	$	82,718	$	256,953	$	222,210
Lighting control products		10,841		8,476		28,094		23,938
Total	$	106,456	$	91,194	$	285,047	$	246,148

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]

	September 30,		December 31,
Country	2016		2015
China	$	49,574	$	40,738
United States		42,752		40,405
Bermuda		20,185		11,624
Taiwan		8,617		126
Other		892		431
Total	$	122,020	$	93,324