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Note 6 - Net Income Per Share - Computation of Net Income per Share - Basic & Diluted (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Net income available for shareholders $ 1,752 $ 3,060 $ 4,058 $ 4,941
Weighted average outstanding shares of common stock (in shares) 3,598 3,508 3,587 3,504
Dilutive effect of stock options (in shares) 144 132 128 144
Common stock and equivalents (in shares) 3,742 3,640 3,715 3,648
Basic (in dollars per share) $ 0.49 $ 0.87 $ 1.13 $ 1.41
Diluted (in dollars per share) $ 0.47 $ 0.84 $ 1.09 $ 1.35