Note 13 - Derivative Financial Instruments (Details Textual) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Mar. 31, 2018
Other Income [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net, Total	$ (300)	$ 276
Foreign Exchange Forward [Member]
Derivative Contract Maximum Maturity Term		120 days
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(394)	$ (513)
Foreign Exchange Forward [Member] | Cost of Sales [Member]
Gain (Loss) on Derivative Instruments, Net, Pretax, Total	943	557
Foreign Exchange Forward [Member] | Sales [Member]
Gain (Loss) on Derivative Instruments, Net, Pretax, Total	1,070	268
Foreign Exchange Contract [Member]
Derivative, Notional Amount	$ 196,547	$ 196,547	$ 156,238