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Concentration of Credit Risk (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Risks and Uncertainties [Abstract]        
Threshold of not insured deposits by FDIC $ 250,000      
Cash and cash equivalents 21,790,068 $ 15,826,515 $ 23,626,761 $ 20,810,018
Cash and cash equivalents uninsured amount $ 21,300,000 $ 15,300,000