Note 14 - Segment and Geographic Information - Revenue by Product Line (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Power Semiconductors [Member]
Net Revenues	$ 51,196	$ 52,245	$ 159,607	$ 165,993
Integrated Circuits [Member]
Net Revenues	18,749	23,484	63,257	70,804
Systems and RF Power Semiconductors [Member]
Net Revenues	5,188	5,597	14,573	19,044
Net Revenues	$ 75,133	$ 81,326	$ 237,437	$ 255,841