Note 3 - Goodwill and Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2018
Gross Carrying Amount	$ 10,891	$ 10,891
Accumulated Amortization	(8,797)	(7,320)
Foreign Currency Translation Adjustment	189	381
Net Carrying Value	2,283	3,952
Developed Technology Rights [Member]
Gross Carrying Amount	5,034	5,034
Accumulated Amortization	(4,189)	(3,486)
Foreign Currency Translation Adjustment	134	219
Net Carrying Value	979	1,767
Customer Relationships [Member]
Gross Carrying Amount	5,857	5,857
Accumulated Amortization	(4,608)	(3,834)
Foreign Currency Translation Adjustment	55	162
Net Carrying Value	$ 1,304	$ 2,185