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INVESTMENTS
 12 Months Ended
Dec. 31, 2013
INVESTMENTS  
INVESTMENTS

NOTE B—INVESTMENTS

        The amortized cost, unrealized gains and estimated fair values of the Company's available-for-sale securities held are summarized as follows:

 
   December 31,  
 
   2013   2012  
 
   (in thousands)
  

U.S. Treasury Bonds, stripped of interest, maturing 2020 and 2022, aggregate par value of $1.6 million and $1.6 million, respectively

              

Amortized cost

   $ 1,004   $ 943  

Gross unrealized gains

     310     472  
           
​ ​ ​ ​ ​ ​ ​ ​

Estimated fair value

   $ 1,314   $ 1,415  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           

        During 2013, 2012, and 2011, the Company recognized approximately $0, $4,000 and $0, respectively, of realized gains from its investments in available-for-sale securities. The basis of available for sale securities sold is determined using the specific identification method.

        The realized gains for each year results from the disposition of such securities due to the release of the Company's obligation related to securing its commitment under debentures (Notes C & F).

        The amortized cost and estimated fair values of available-for-sale securities, by contractual maturity at December 31, 2013 are shown below.

 
   Amortized
cost		   Estimated
fair value		  
 
   (in thousands)
  

Due within one year

   $ 100   $ 131  

Due after one year through five years

     —     —  

Due after five years through ten years

     904     1,183  

Due after ten years

     —     —  
           
​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 1,004   $ 1,314  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​