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Income Taxes (Details 1) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Net deferred tax assets    
Current deferred tax assets, net $ 9,395,987 $ 9,968,929
Long-term deferred tax assets, net 11,605,812 12,716,169
Net deferred income tax assets $ 21,001,799 $ 22,685,098