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Cash, Cash Equivalents, Short-Term Investments and Long-Term Investments (Details) - USD ($)
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Schedule of Cash, cash equivalents, short-term investments and long-term investments        
Cash and cash equivalents $ 4,408,415 $ 2,469,087 $ 1,573,328 $ 850,028
Short-term investments 5,199,000   4,464,000  
Subtotal 9,607,415   6,037,328  
Long-term investments 0   487,000  
Total 9,607,415   $ 6,524,328  
Increase in cash and cash equivalents 2,835,087 $ 1,619,059    
Increase in short-term investments [1] 735,000      
Increase in cash and cash equivalents and short term investments 3,570,087      
Increase in long term investments [1] (487,000)      
Increase in cash and cash equivalents short term and long term investments $ 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.