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Cash, Cash Equivalents, Short-Term Investments and Long-Term Investments (Tables)
 12 Months Ended
Dec. 31, 2016
Cash, Cash Equivalents, Short-Term Investments and Long-Term Investments [Abstract]  
Schedule of cash, cash equivalents and short-term investments and long-term investments
  As of December 31,  Increase 
  2016  2015  (Decrease) 
Cash and cash equivalents $5,150,344  $1,573,328  $3,577,016 
Short-term investments  5,474,013   4,470,574   1,003,439 
Subtotal  10,624,357   6,043,902   4,580,455 
Long-term investments  -   489,648   (489,648)
Total $10,624,357  $6,533,550  $4,090,807
Schedule of held to maturity securities
  

As of December 31,

 
  2016  2015 
Amortized cost $5,450,000  $4,951,000 
Accrued interest  24,013   9,222 
Gross unrealized gains  2,073   25 
Gross unrealized losses  (59)  (6,277)
Estimated fair value $5,476,027  $4,953,970