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Net Income Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net Income Per Share        
Net income available for stockholders $ 2,248 $ 2,053 $ 4,348 $ 3,733
Weighted average outstanding shares of common stock 3,349,000 3,282,000 3,343,000 3,278,000
Dilutive effect of stock options (in shares) 189,000 171,000 188,000 155,000
Common stock and equivalents (in shares) 3,538,000 3,453,000 3,531,000 3,433,000
Net income per share:        
Basic (in dollars per share) $ 0.67 $ 0.63 $ 1.30 $ 1.14
Diluted (in dollars per share) $ 0.64 $ 0.59 $ 1.23 $ 1.09
Anti-dilutive stock options excluded from the calculation of diluted earnings per share (in shares) 84,000   84,000