Note 15 - Segment and Geographic Information (Tables)

9 Months Ended

Dec. 31, 2016

Notes Tables

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

	Three Months Ended				Nine Months Ended
	December 31,				December 31,
	2016		2015		2016		2015
	(unaudited)				(unaudited)
United States	$	20,605	$	18,334	$	60,291	$	57,784
Europe and the Middle East
France		1,901		2,382		7,472		6,724
Germany		9,253		7,201		26,812		24,123
Russia		353		2,196		941		2,914
Netherlands		1,241		761		3,322		2,298
United Kingdom		3,565		3,686		10,401		10,400
Other		6,646		6,217		19,431		21,281
Asia Pacific
China		20,690		19,090		64,548		60,378
Japan		1,663		1,451		5,089		7,175
Korea		4,268		5,360		13,316		17,585
Malaysia		1,300		689		3,392		3,253
Singapore		3,751		3,112		10,335		9,249
Other		2,020		2,527		7,021		7,655
Rest of the World
India		1,209		1,095		3,316		3,136
Other		1,019		1,032		3,064		3,482
Total	$	79,484	$	75,133	$	238,751	$	237,437

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

	Three Months Ended December 31,				Nine Months Ended December 31,
	2016		2015		2016		2015
	(unaudited)				(unaudited)
Power semiconductors	$	54,647	$	51,196	$	164,663	$	159,607
Integrated circuits		20,032		18,749		60,967		63,257
Systems and RF power semiconductors		4,805		5,188		13,121		14,573
Total	$	79,484	$	75,133	$	238,751	$	237,437