Note 6 - Segment and Geographic Information (Tables)

3 Months Ended

Mar. 31, 2016

Notes Tables

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

	Three Months Ended March 31,
Customer	2016			2015
Distributor A		20	%		25	%

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

	March 31,			December 31,
Customer	2016			2015
Distributor A		20	%		28	%
Distributor B		13	%		17	%

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

	Three Months Ended March 31,
Country or Region	2016		2015
China	$	52,388	$	45,802
Taiwan		8,855		11,029
Korea		7,093		4,245
Europe		6,985		5,115
Southeast Asia		4,338		3,739
Japan		2,650		1,885
United States		2,146		1,693
Other		57		30
Total	$	84,512	$	73,538

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

	Three Months Ended March 31,
Product Family	2016		2015
DC to DC products	$	77,118	$	66,297
Lighting control products		7,394		7,241
Total	$	84,512	$	73,538

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

	March 31,		December 31,
Country	2016		2015
China	$	42,187	$	40,738
United States		41,459		40,405
Bermuda		11,111		11,624
Other		775		557
Total	$	95,532	$	93,324