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Cash, Cash Equivalents, Short-Term Investments and Long-Term Investments (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Schedule of Cash, cash equivalents, short-term investments and long-term investments        
Cash and cash equivalents $ 4,561,304 $ 2,470,088 $ 1,573,328 $ 850,028
Short-term investments 5,952,000   4,464,000  
Subtotal 10,513,304   6,037,328  
Long-term investments 487,000   487,000  
Total 11,000,304   $ 6,524,328  
Increase in cash and cash equivalents 2,987,976 $ 1,620,060    
Increase in short-term investments 1,488,000      
Increase in cash and cash equivalents and short term investments 4,475,976      
Increase in long term investments 0      
Increase in cash and cash equivalents short term and long term investments $ 4,475,976