Note 3 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Amortization of Intangible Assets	$ 0.5	$ 0.5	$ 1.6	$ 1.4
Developed Technology Rights [Member]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			3 years 226 days
Customer Relationships [Member]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			3 years 197 days