Note 6 - Segment Information (Tables)

9 Months Ended

Sep. 30, 2012

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

	Three months ended September 30,						Nine months ended September 30,
Customers	2012			2011			2012			2011
A		18	%		21	%		16	%		18	%
B		17	%		10	%		15	%		*

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	2012		2011		2012		2011
China	$	31,023	$	32,480	$	95,207	$	87,360
Taiwan		7,579		6,110		21,814		16,395
Korea		3,022		2,754		7,581		11,598
Europe		5,004		3,736		12,987		10,778
Japan		2,029		2,475		6,690		8,193
USA		1,437		1,230		4,150		3,196
Other		6,414		4,177		17,170		11,538
Total	$	56,508	$	52,962	$	165,599	$	149,058

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

	Three months ended September 30,				Nine months ended September 30,
Product Family	2012			2011*		2012		2011*
DC to DC Converters	$	49,710	$	44,936	$	145,217	$	128,287
Lighting Control Products		6,798		8,026		20,382		20,771
Total	$	56,508	$	52,962	$	165,599	$	149,058

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

	September 30,		December 31,
	2012		2011
China	$	37,859	$	32,566
United States		22,868		15,662
Taiwan		86		98
Japan		65		70
Other		49		51
TOTAL	$	60,927	$	48,447