Note 14 - Segment and Geographic Information (Tables)

6 Months Ended

Sep. 30, 2016

Notes Tables

Revenue from External Customers by Geographic Areas [Table Text Block]

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2016		2015		2016		2015
	(unaudited)				(unaudited)
United States	$	20,185	$	19,317	$	39,686	$	39,450
Europe and the Middle East
France		2,121		2,302		5,571		4,342
Germany		8,960		8,845		17,559		16,922
United Kingdom		3,209		3,494		6,836		6,714
Other		7,285		8,663		15,454		17,319
Asia Pacific
China		21,218		20,053		43,858		41,288
Japan		1,708		2,402		3,426		5,724
Korea		4,353		6,089		9,048		12,225
Malaysia		1,288		1,322		2,092		2,564
Singapore		3,577		3,020		6,584		6,137
Thailand		1,040		992		1,851		2,035
Other		1,403		1,609		3,150		3,093
Rest of the World
India		1,207		909		2,107		2,041
Other		1,075		1,240		2,045		2,450
Total	$	78,629	$	80,257	$	159,267	$	162,304

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

	Three Months Ended September 30,				Six Months Ended September 30,
	2016		2015		2016		2015
	(unaudited)				(unaudited)
Power semiconductors	$	53,537	$	53,433	$	110,016	$	108,411
Integrated circuits		20,553		22,024		40,935		44,508
Systems and RF power semiconductors		4,539		4,800		8,316		9,385
Total	$	78,629	$	80,257	$	159,267	$	162,304