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Investments
6 Months Ended
Jun. 30, 2011
Investments, Debt and Equity Securities [Abstract]  
Investments
4.  Investments

The Company invests in a variety of highly liquid investment-grade securities.  The following is a summary of the Company’s available for sale securities:

   
At June 30, 2011
 
(in thousands)
 
Amortized Costs
  
Gross Unrealized Gains
  
Gross Unrealized Losses
  
Estimated Fair Market Value
 
U.S. Treasury securities
 $5,045  $3  $-  $5,048 

   
At December 31, 2010
 
              
(in thousands)
 
Amortized Costs
  
Gross Unrealized Gains
  
Gross Unrealized Losses
  
Estimated Fair Market Value
 
U.S. Treasury securities
 $2,030  $-  $1  $2,029