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Cash, Cash Equivalents, Short-Term Investments and Long-Term Investments (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Cash, cash equivalents, short-term investments and long-term investments        
Cash and cash equivalents $ 1,573,328 $ 850,028 $ 2,270,385 $ 2,673,719
Short-term investments 4,464,000 2,489,000    
Subtotal 6,037,328 3,339,028    
Long-term investments 487,000 496,000    
Total 6,524,328 3,835,028    
Increase (Decrease) in cash and cash equivalents 723,300 $ (1,420,357) $ (403,334)  
Increase (Decrease) in short-term investments 1,975,000      
Increase (Decrease) in cash and cash equivalents and short term investments 2,698,300      
Increase (Decrease) in long term investments (9,000)      
Increase (Decrease) in cash and cash equivalents short term and long term investments $ 2,689,300