Concentration of Credit Risk (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Risks and Uncertainties [Abstract]
Threshold of not insured deposits by FDIC	$ 250,000
Cash and cash equivalents	20,214,468	$ 27,928,472	$ 21,790,068	$ 15,826,515
Cash and cash equivalents uninsured amount	$ 19,300,000	$ 27,100,000