Note 14 - Segment and Geographic - Segment and Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
UNITED STATES
Net Revenues	$ 18,334	$ 20,506	$ 57,784	$ 64,512
FRANCE
Net Revenues	2,382	2,208	6,724	5,957
GERMANY
Net Revenues	7,201	7,720	24,123	24,195
ITALY
Net Revenues	758	1,189	2,991	3,571
RUSSIAN FEDERATION
Net Revenues	2,178	1,621	2,896	4,482
SWEDEN
Net Revenues	422	1,138	1,701	3,732
UNITED KINGDOM
Net Revenues	3,686	4,752	10,400	15,953
Other Europe and the Middle East Regions [Member]
Net Revenues	5,798	6,020	18,889	19,913
CHINA
Net Revenues	19,090	20,949	60,378	61,831
JAPAN
Net Revenues	1,451	1,675	7,175	5,637
KOREA, REPUBLIC OF
Net Revenues	5,360	4,661	17,585	16,789
MALAYSIA
Net Revenues	689	1,197	3,253	4,319
SINGAPORE
Net Revenues	3,112	2,753	9,249	8,823
THAILAND
Net Revenues	997	996	3,032	3,023
Other Asia Pacific Regions [Member]
Net Revenues	1,686	1,675	4,777	5,491
INDIA
Net Revenues	1,095	1,150	3,136	3,779
Other Rest of the World [Member]
Net Revenues	894	1,116	3,344	3,834
Net Revenues	$ 75,133	$ 81,326	$ 237,437	$ 255,841