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Income Taxes (Details) (USD $)
3 Months Ended 9 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Income Taxes        
Unrecognized tax benefits $ 0   $ 0  
Income tax provision $ 986,676 $ 805,989 $ 2,801,393 $ 2,686,778
Income tax expense, effective rates (as a percent) 29.00% 35.00% 34.00% 40.00%