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Note 6 - Net Income Per Share (Details) - Computation of Net Income per Share - Basic & Diluted - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Computation of Net Income per Share - Basic & Diluted [Abstract]    
Net income available for stockholders (in Dollars) $ 2,306 $ 1,881
Weighted average outstanding shares of common stock 3,575 3,501
Dilutive effect of stock options 111 155
Common stock and equivalents 3,686 3,656
Net income per share:    
Basic (in Dollars per share) $ 0.65 $ 0.54
Diluted (in Dollars per share) $ 0.63 $ 0.51