Note 3 - Goodwill and Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Mar. 31, 2017
Gross Carrying Amount	$ 10,891	$ 10,891
Accumulated Amortization	(6,726)	(4,946)
Foreign Currency Translation Adjustment	287	(85)
Net Carrying Value	4,452	5,860
Developed Technology Rights [Member]
Gross Carrying Amount	5,034	5,034
Accumulated Amortization	(3,204)	(2,347)
Foreign Currency Translation Adjustment	168	(50)
Net Carrying Value	1,998	2,637
Customer Relationships [Member]
Gross Carrying Amount	5,857	5,857
Accumulated Amortization	(3,522)	(2,599)
Foreign Currency Translation Adjustment	119	(35)
Net Carrying Value	$ 2,454	$ 3,223