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Summary of Significant Accounting Policies - Summary of change to consolidated statements of shareholders' equity (Details 2) (USD $)
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Consolidated Statements of Shareholders' Equity        
Total shareholders' equity $ 126,965,096 $ 135,263,161 $ 114,546,111 $ 96,806,816
Retained Earnings
       
Consolidated Statements of Shareholders' Equity        
Total shareholders' equity 96,933,548 106,837,118 88,208,380 71,440,086
Reported | Retained Earnings
       
Consolidated Statements of Shareholders' Equity        
Total shareholders' equity   107,513,008 88,875,737 72,070,553
Correction | Retained Earnings
       
Consolidated Statements of Shareholders' Equity        
Total shareholders' equity   $ (675,890) $ (667,357) $ (630,467)