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Marketable Securities:
 12 Months Ended
Dec. 31, 2011
Marketable Securities:  
Marketable Securities:

7. Marketable Securities:

        Marketable Securities at December 31, 2011 and 2010 consists of the following:

 
   2011   2010  

Government debt securities, at par value

   $ 25,147   $ 26,509  

Less discount

     (314 )   (574 )
           

 

     24,833     25,935  

Unrealized gain

     1,803     2,612  
           

Fair value

   $ 26,636   $ 28,547  
           

        Future contractual maturities of marketable securities at December 31, 2011 are as follows:

1 year or less

   $ 1,378  

2 to 5 years

     23,769  
       

 

   $ 25,147  
       

        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).