Note 14 Segment and Geographic Information (Tables)

12 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

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

		Year Ended March 31,
		2013		2012		2011
United States		$	84,789	$	103,122	$	102,190
Europe and the Middle East
	France		5,235		7,433		7,071
	Germany		32,287		47,499		42,385
	Italy		4,087		6,274		6,054
	Sweden		4,588		5,297		4,922
	United Kingdom		23,853		31,131		28,729
	Other		28,518		40,927		37,673
Asia Pacific
	China		44,504		61,723		68,794
	Japan		6,514		9,070		11,737
	Korea		8,311		11,988		9,464
	Malaysia		4,606		4,744		4,953
	Singapore		9,994		10,332		10,481
	Taiwan		3,981		6,797		9,372
	Other		5,494		6,483		5,196
Rest of the World
	India		6,080		8,198		8,319
	Other		7,173		6,986		5,933
Total		$	280,014	$	368,004	$	363,273

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

	Year Ended March 31,
	2013		2012			2011
Power semiconductors	$	200,907	$	277,718	$	252,892
Integrated circuits		57,993		63,597		83,225
Systems and RF power semiconductors		21,114		26,689		27,156
Total	$	280,014	$	368,004	$	363,273

Schedule of Revenue from External Customers and Long-lived Assets, by Geographical Areas [Table Text Block]

		Year Ended March 31,
		2013		2012		2011
Net revenues:
	Foreign	$	134,962	$	175,667	$	163,277
	Domestic		145,052		192,337		199,996
		$	280,014	$	368,004	$	363,273
Net income:
	Foreign	$	7,774	$	22,487	$	16,829
	Domestic		(126)		7,819		19,818
		$	7,648	$	30,306	$	36,647
				Year Ended March 31,
				2013		2012
Property, plant and equipment, net:
	United States			$	29,308	$	29,760
	Germany				20,711		24,098
	United Kingdom				1,971		2,192
	Other countries				5		21
	Total property, plant and equipment			$	51,995	$	56,071