Marketable Securities:

6 Months Ended

Jun. 30, 2013

Marketable Securities:

Marketable Securities:

6. Marketable Securities:

        Marketable securities consist of the following:

	June 30, 2013			December 31, 2012
Government debt securities, at par value	$	23,080		$	23,769
Less discount		(18	)		(102	)
		23,062			23,667
Unrealized gain		137			685
Fair value (Level 1 measurement)	$	23,199		$	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).