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Marketable Securities:
 12 Months Ended
Dec. 31, 2012
Marketable Securities:  
Marketable Securities:

7. Marketable Securities:

        Marketable Securities at December 31, 2012 and 2011 consists of the following:

 
   2012   2011  

Government debt securities, at par value

   $ 23,769   $ 25,147  

Less discount

     (102 )   (314 )
           

 

     23,667     24,833  

Unrealized gain

     685     1,803  
           

Fair value

   $ 24,352   $ 26,636  
           

        The future contractual maturities of marketable securities is less than one year. The proceeds from maturities and interest receipts from the marketable securities are restricted to the service of the Greeley Note (See Note 11—Bank and Other Notes Payable).