Note 15 - Segment and Geographic Information (Tables)

12 Months Ended

Mar. 31, 2016

Notes Tables

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

	Year Ended March 31,
	2016		2015		2014
United States	$	75,994	$	85,314	$	89,734
Europe and the Middle East
France		9,076		7,917		5,554
Germany		33,215		32,866		34,423
Hungary		2,082		2,571		3,620
Italy		4,328		4,645		4,506
Netherlands		3,608		2,315		2,080
Russia		4,755		5,051		2,821
Sweden		2,155		4,460		4,938
Switzerland		2,789		2,569		3,714
Turkey		2,376		2,658		2,323
United Kingdom		13,502		19,832		19,524
Other		14,437		15,223		15,546
Asia Pacific
China		79,575		83,597		83,849
Indonesia		2,128		3,224		1,914
Japan		9,271		8,469		6,740
Korea		23,215		22,371		19,466
Malaysia		4,662		5,580		3,766
Singapore		12,353		11,694		11,838
Taiwan		3,151		2,688		2,962
Thailand		3,904		4,300		3,031
Other		2,083		1,143		2,075
Rest of the World
India		4,293		5,163		5,245
Other		4,257		5,117		6,661
Total	$	317,209	$	338,767	$	336,330

	Year Ended March 31,
	2016		2015		2014
Net revenues:
Foreign	$	159,984	$	188,964	$	167,428
Domestic		157,225		149,803		168,902
	$	317,209	$	338,767	$	336,330
Net income:
Foreign	$	11,039	$	21,379	$	4,087
Domestic		3,702		2,361		1,959
	$	14,741	$	23,740	$	6,046

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

	Year Ended March 31,
	2016		2015		2014
Power semiconductors	$	213,347	$	219,445	$	222,813
Integrated circuits		84,078		95,547		91,189
Systems and RF power semiconductors		19,784		23,775		22,328
Total	$	317,209	$	338,767	$	336,330

Long-lived Assets by Geographic Areas [Table Text Block]

	Year Ended March 31,
	2016		2015		2014
Property, plant and equipment, net:
United States	$	26,792	$	27,740	$	27,287
Germany		14,506		13,228		21,697
Other countries		1,325		1,577		1,585
Total property, plant and equipment	$	42,623	$	42,545	$	50,569