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Investments In Securities (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
security
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
security
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Available-for-sale securities $ 18,841,027   $ 30,427,114
Unrealized losses $ 346,354   $ 849,651
Number of securities with unrealized losses | security 21   36
Other-than-temporary impairment charges $ 0 $ 115,238  
Impairment amount for cost-method investments $ 0