Note 17 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Operating Leases, Rent Expense, Net	$ 1,500	$ 1,600	$ 1,400
Restricted Cash and Cash Equivalents, Current	1,330	$ 277
Foreign Tax Authority [Member] | Bureau of Internal Revenue [Member] | Tax Year 2010 [Member]
Loss Contingency, Estimate of Possible Loss	2,500
Foreign Tax Authority [Member] | Bureau of Internal Revenue [Member] | Tax Year 2011 [Member]
Loss Contingency, Estimate of Possible Loss	$ 156