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Income Tax (Details 2) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Summary of Components of income tax expense        
Current $ 626,528 $ 121,988 $ 855,572 $ 265,092
Deferred 142,013 199,022 555,716 563,191
Income tax expense $ 768,541 $ 321,010 $ 1,478,172 $ 845,866