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Cash, Cash Equivalents, Short-Term Investments and Long-Term Investments (Details) - USD ($)
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Schedule of Cash, cash equivalents, short-term investments and long-term investments        
Cash and cash equivalents $ 2,469,087 $ 1,166,211 $ 850,028 $ 2,270,385
Short-term investments 3,720,000   2,489,000  
Subtotal 6,189,087   3,339,028  
Long-term investments 487,000   496,000  
Total 6,676,087   $ 3,835,028  
Increase (Decrease) in cash and cash equivalents 1,619,059 $ (1,104,174)    
Increase (Decrease) in short-term investments 1,231,000      
Increase (Decrease) in cash and cash equivalents and short term investments 2,850,059      
Increase (Decrease) in long term investments (9,000)      
Increase (Decrease) in cash and cash equivalents short term and long term investments $ 2,841,059