Note 6 - Segment Information (Tables)

3 Months Ended

Mar. 31, 2013

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

		Three months ended March 31,
Customers		2013			2012
	A		34	%		29	%

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

	Three months ended March 31,
Country	2013		2012
China	$	26,779	$	29,093
Taiwan		7,519		6,415
Europe		3,950		4,190
Japan		1,521		2,306
Korea		2,418		1,959
USA		1,901		1,112
Rest of Asia		7,329		5,054
Other		53		355
Total	$	51,470	$	50,484

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

	Three months ended March 31,
Product Family	2013		2012
DC to DC converters	$	46,442	$	44,342
Lighting control products		5,028		6,142
Total	$	51,470	$	50,484

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

	March 31, 2013		December 31, 2012
China	$	38,694	$	37,071
USA		25,085		23,163
Taiwan		83		90
Japan		49		57
Other		65		55
Total	$	63,976	$	60,436