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Summary of Significant Accounting Policies - Basic and diluted earnings per share (Details 2) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Accounting Policies [Abstract]                      
Numerator for earnings per share - net income $ 2,859,539 $ 3,826,768 $ 4,316,552 $ 5,700,493 $ 4,787,296 $ 4,596,056 $ 5,150,138 $ 5,407,456 $ 16,703,352 $ 19,940,946 $ 22,221,759
Denominator:                      
Denominator for basic earnings per share - weighted average shares                 12,096,000 11,977,174 11,747,160
Effect of dilutive securities:                      
Stock options and other share awards                 229,000 241,242 285,971
Denominator for diluted earnings per share                 12,325,000 12,218,416 12,033,131
Earnings per share - basic (in dollars per share) $ 0.24 $ 0.32 $ 0.36 $ 0.47 $ 0.40 $ 0.38 $ 0.43 $ 0.45 $ 1.38 $ 1.66 $ 1.89
Earnings per share - diluted (in dollars per share) $ 0.23 $ 0.31 $ 0.35 $ 0.46 $ 0.39 $ 0.38 $ 0.42 $ 0.44 $ 1.36 $ 1.63 $ 1.85