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Income Taxes (Details) (USD $)
3 Months Ended 6 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Income Taxes        
Income tax expense (benefit) $ 1,054,499 $ 1,008,195 $ 1,814,717 $ 1,880,789
Income tax expense, effective rates (as a percent) 35.00% 41.40% 36.80% 42.30%