Note 13 - Computation of Earnings per Share - Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Net income	$ 3,019	$ 2,985
Weighted average shares - basic (in shares)	31,401	31,746
Weighted average shares - diluted (in shares)	32,001	32,733
Net income per share - basic (in dollars per share)	$ 0.10	$ 0.09
Net income per share - diluted (in dollars per share)	$ 0.09	$ 0.09