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Cash, Cash Equivalents, Short-Term Investments and Long-Term Investments (Details) - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Cash, Cash Equivalents, Short-Term Investments and Long-Term Investments [Abstract]        
Cash and cash equivalents $ 1,925,179 $ 1,700,853 $ 850,028 $ 2,270,385
Short-term investments 1,984,000   2,489,000  
Subtotal 3,909,179   3,339,028  
Long-term investments 0   496,000  
Total 3,909,179   $ 3,835,028  
Increase (Decrease) in cash and cash equivalents 1,075,151 $ (569,532)    
Increase (Decrease) in short-term investments (505,000)      
Increase (Decrease) in cash and cash equivalents and short term investments 570,151      
Increase (Decrease) in long term investments (496,000)      
Increase (Decrease) in cash and cash equivalents short term and long term investments $ 74,151