Note 14 Segment and Geographic Information (Tables)

6 Months Ended

Sep. 30, 2014

Segment Reporting [Abstract]

Schedule of Revenue from External Customers by Geographic Area [Table Text Block]

		Three Months Ended				Six Months Ended
		September 30,				September 30,
			2014		2013	2014		2013
		(unaudited)				(unaudited)
United States		$	21,502	$	22,526	$	44,006	$	44,084
Europe and the Middle East
	France		1,897		1,329		3,749		2,632
	Germany		8,026		9,509		16,475		17,162
	Italy		909		1,021		2,382		1,994
	Russia		2,157		899		2,860		1,380
	Sweden		1,309		1,288		2,594		2,668
	Switzerland		853		1,077		1,671		2,114
	United Kingdom		5,822		5,411		11,201		10,747
	Other		5,957		6,046		12,223		11,802
Asia Pacific
	China		20,480		20,267		40,882		34,941
	Japan		2,161		1,701		3,962		3,406
	Korea		5,689		5,440		12,128		7,304
	Malaysia		1,490		920		3,122		1,623
	Singapore		2,913		3,151		6,070		5,744
	Other		2,685		2,590		5,843		4,089
Rest of the World
	India		1,380		1,199		2,629		2,547
	Other		1,205		1,527		2,718		2,850
Total		$	86,435	$	85,901	$	174,515	$	157,087

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

	Three Months Ended September 30,				Six Months Ended September 30,
		2014		2013		2014		2013
		(unaudited)				(unaudited)
Power semiconductors	$	55,780	$	59,720	$	113,748	$	111,386
Integrated circuits		23,438		20,945		47,320		34,600
Systems and RF power semiconductors		7,217		5,236		13,447		11,101
Total	$	86,435	$	85,901	$	174,515	$	157,087