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Cash, Cash Equivalents, Short-Term Investments and Long-Term Investments (Tables)
 9 Months Ended
Sep. 30, 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

September 30, 2016

  

As of

December 31, 2015

  

Increase

(Decrease)

 
Cash and cash equivalents $4,408,415  $1,573,328  $2,835,087 
Short-term investments(1)  5,199,000   4,464,000   735,000 
Subtotal  9,607,415   6,037,328   3,570,087 
Long-term investments (1)  0   487,000   (487,000)
Total $9,607,415  $6,524,328  $3,083,087 

 

(1) We accrued $20,065 and $9,221 in interest income on these investments as of September 30, 2016 and December 31, 2015, respectively, which was recorded in other receivables.
Schedule of held to maturity securities
    Gross Unrealized    
  Cost  Gains  Losses  

Estimated

Fair Value

 
Certificates of deposit $5,199,000  $5,642  $0  $5,204,642