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Earnings Per Share - Basic and diluted earnings per share (Details) (USD $)
 3 Months Ended 9 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]        
Numerator for earnings per share - net income $ 3,826,768 $ 4,596,056 $ 13,843,813 $ 15,153,650
Denominator:        
Denominator for basic earnings per share - weighted average shares 12,108,988 11,981,627 12,088,835 11,961,886
Effect of dilutive securities:        
Stock options and other share awards 225,191 211,831 197,136 229,895
Denominator for diluted earnings per share 12,334,179 12,193,458 12,285,971 12,191,781
Earnings per share:        
Basic (in dollars per share) $ 0.32 $ 0.38 $ 1.15 $ 1.27
Diluted (in dollars per share) $ 0.31 $ 0.38 $ 1.13 $ 1.24