Note 6 - Segment Information (Tables)

6 Months Ended

Jun. 30, 2012

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

		Three months ended June 30,						Six months ended June 30,
Customers		2012			2011			2012			2011
	A		16	%		16	%		15	%		16	%
	B		13	%		*			14	%		*

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	2012		2011		2012		2011
China	$	35,091	$	31,203	$	64,184	$	54,880
Taiwan		7,820		5,156		14,235		10,285
Korea		2,600		4,417		4,559		8,844
Europe		3,793		3,567		7,983		7,042
Japan		2,355		2,740		4,661		5,718
USA		1,601		860		2,713		1,966
Other		5,347		3,685		10,756		7,361
Total	$	58,607	$	51,628	$	109,091	$	96,096

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

	Three months ended June 30,				Six months ended June 30,
Product Family	2012		2011		2012		2011
DC to DC Converters	$	51,165	$	44,771	$	95,507	$	83,351
Lighting Control Products		7,442		6,857		13,584		12,745
Total	$	58,607	$	51,628	$	109,091	$	96,096

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

	June 30, 2012		December 31, 2011
China	$	38,170	$	32,566
United States		21,835		15,662
Taiwan		73		98
Japan		68		70
Other		44		51
TOTAL	$	60,190	$	48,447