Note 14 - Segment and Geographic Information - Revenue by Product Line (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Power Semiconductors [Member]
Net Revenues	$ 54,978	$ 57,968
Integrated Circuits [Member]
Net Revenues	22,484	23,882
System and RF Power Semiconductors [Member]
Net Revenues	4,585	6,230
Net Revenues	$ 82,047	$ 88,080