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Cash and Cash Equivalents and Investments (Tables)
3 Months Ended
Mar. 31, 2015
Cash and Cash Equivalents and Investments [Abstract]  
Schedule of Cash and Cash Equivalents and Investments
    March 31, 2015     December 31, 2014  
             
Cash   $ 12,506,936     $ 7,665,958  
Money market mutual funds     3,990,789       11,730,887  
Cash and cash equivalents     16,497,725       19,396,845  
Investments in debt securities     50,000,000       55,996,000  
Investment in equity securities     8,437,096       8,422,790  
Total investments     58,437,096       64,418,790  
                 
Total cash and cash equivalents and investments   $ 74,934,821     $ 83,815,635  
Fair Value of Cash and Cash Equivalents and Investments
          Fair Value Measurements, Using  
    Total carrying
value as of
March 31, 2015
    Quoted prices
in active
markets
(Level 1)
    Significant other
observable
inputs
(Level 2)
    Significant
unobservable
inputs
(Level 3)
 
                         
Cash and cash equivalents   $ 16,497,725     $ 16,497,725     $ -     $ -  
Investments in debt securities     50,000,000       50,000,000       -       -  
Investment in equity securities     8,437,096       8,437,096       -       -  
                                 
Total investments     58,437,096       58,437,096       -       -  
                                 
Total   $ 74,934,821     $ 74,934,821     $ -     $ -