Note 14 - Segment and Geographic - Segment and Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
UNITED STATES
Net Revenues	$ 19,501	$ 20,133
FRANCE
Net Revenues	3,450	2,040
GERMANY
Net Revenues	8,599	8,077
ITALY
Net Revenues	1,076	1,264
NETHERLANDS
Net Revenues	1,140	695
UNITED KINGDOM
Net Revenues	3,627	3,220
Other Europe and the Middle East Regions [Member]
Net Revenues	5,953	6,697
CHINA
Net Revenues	22,640	21,235
JAPAN
Net Revenues	1,718	3,322
KOREA, REPUBLIC OF
Net Revenues	4,695	6,136
MALAYSIA
Net Revenues	804	1,242
SINGAPORE
Net Revenues	3,007	3,117
THAILAND
Net Revenues	811	1,043
Other Asia Pacific Regions [Member]
Net Revenues	1,747	1,484
INDIA
Net Revenues	900	1,132
Other Rest of the World [Member]
Net Revenues	970	1,210
Net Revenues	$ 80,638	$ 82,047