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Marketable Securities (Tables)
3 Months Ended
Mar. 31, 2014
Investments Debt And Equity Securities [Abstract]  
Summary of Available-For-Sale Securities Owned by Company

The following is a summary of available-for-sale securities owned by the Company:

 

     March 31, 2014  
     Investment
at cost
     Unrealized
gains
     Unrealized
losses
     Estimated
fair value
 

Common stock

   $ 238,504           165,380       $ —         $ 403,884   
  

 

 

    

 

 

    

 

 

    

 

 

 

 

     December 31, 2013  
     Investment
at cost
     Unrealized
gains
     Unrealized
losses
     Estimated
fair value
 

Common stock

   $ 238,504       $ 167,630       $ —         $ 406,134