Note 14 - Computation of Earnings Per Share - Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Net income	$ 5,100	$ 2,286	$ 12,054	$ 8,544
Weighted average shares - basic (in shares)	31,558	31,487	31,484	31,626
Weighted average shares - diluted (in shares)	32,209	32,343	32,119	32,483
Net income per share - basic (in dollars per share)	$ 0.16	$ 0.07	$ 0.38	$ 0.27
Net income per share - diluted (in dollars per share)	$ 0.16	$ 0.07	$ 0.38	$ 0.26