Note 6 - Segment and Geographic Information (Tables)

6 Months Ended

Jun. 30, 2016

Notes Tables

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

	Three Months Ended June 30,						Six Months Ended June 30,
Customer	2016			2015			2016			2015
Distributor A		24	%		23	%		22	%		24	%

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

	June 30,			December 31,
Customer	2016			2015
Distributor A		27	%		28	%
Distributor B		11	%		17	%

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

	Three Months Ended June 30,				Six Months Ended June 30,
Country or Region	2016		2015		2016		2015
China	$	60,928	$	53,450	$	113,316	$	99,252
Taiwan		10,160		10,143		19,015		21,172
Europe		7,054		5,317		14,039		10,432
Korea		7,024		5,109		14,117		9,354
Southeast Asia		3,501		3,336		7,840		7,075
Japan		3,037		2,412		5,687		4,297
United States		2,303		1,566		4,449		3,259
Other		72		83		128		113
Total	$	94,079	$	81,416	$	178,591	$	154,954

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

	Three Months Ended June 30,				Six Months Ended June 30,
Product Family	2016		2015		2016		2015
DC to DC products	$	84,221	$	73,195	$	161,339	$	139,492
Lighting control products		9,858		8,221		17,252		15,462
Total	$	94,079	$	81,416	$	178,591	$	154,954

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

	June 30,		December 31,
Country	2016		2015
China	$	49,959	$	40,738
United States		41,983		40,405
Bermuda		20,598		11,624
Other		1,049		557
Total	$	113,589	$	93,324