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Marketable Securities:
 3 Months Ended
Mar. 31, 2013
Marketable Securities:  
Marketable Securities:

6. Marketable Securities:

        Marketable securities consist of the following:

 
   March 31,
2013		   December 31,
2012		  

Government debt securities, at par value

   $ 23,670   $ 23,769  

Less discount

     (58 )   (102 )
           

 

     23,612     23,667  

Unrealized gain

     416     685  
           

Fair value (Level 1 measurement)

   $ 24,028   $ 24,352  
           

        The future contractual maturities of marketable securities are 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 10—Bank and Other Notes Payable).