Note 2 - Summary of Significant Accounting Policies - Excess and Obsolete Inventory Reserve (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Beginning Balance	$ 21,380	$ 22,753	$ 24,304
Utilization or sale	(3,813)	(2,455)	(1,637)
Scrap	(3,682)	(3,217)	(2,901)
Additional provision	5,838	4,125	4,487
Foreign currency translation adjustments	(425)	174	(1,500)
Ending Balance	$ 19,298	$ 21,380	$ 22,753