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INVESTMENT SECURITIES (Tables)
3 Months Ended
Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Held-to-maturity Securities

 

    March 31, 2017  
    Amortized cost, as adjusted     Gross unrealized holding gains     Gross unrealized holding losses     Estimated fair value  
Short-term investments:                        
Obligations of domestic governmental agencies (maturing between April 2017 and September 2017) (held-to-maturity)    $ 13,823,332     $ 607     $ 5,255     $ 13,818,684  
Total short-term investment securities   $ 13,823,332     $ 607     $ 5,255     $ 13,818,684  

 

 

    December 31, 2016  
    Amortized cost, as adjusted     Gross unrealized holding gains     Gross unrealized holding losses     Estimated fair value  
Short-term investments:                        
Obligations of domestic governmental agencies (maturing between February 2017 and September 2017) (held-to-maturity)    $ 19,853,860     $ 3,270     $ 2,492     $ 19,854,638  
Total short-term investment securities   $ 19,853,860     $ 3,270     $ 2,492     $ 19,854,638