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Marketable Securities
6 Months Ended
Jun. 30, 2011
Marketable Securities [Abstract]  
Marketable Securities
3.  Marketable Securities
 
The Company held $19.1 million of marketable securities at June 30, 2011.  The Company has classified these investments as available for sale.  These investments are comprised of federally insured certificates of deposit as follows: $3 million with a maturity date of July 14, 2011; $8.1 million with a maturity date of July 28, 2011; and $6 million with a maturity date of March 29, 2012.