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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2012
Fair Value of Financial Instruments [Abstract]  
Schedule of estimated fair values of financial instruments

The carrying amounts and estimated fair values of these financial instruments (all are liabilities) at June 30, 2012, are as follows (in thousands):

 

                 
    Carrying
Amount
    Estimated
Fair  Value
 

Promissory notes

  $ 3,290     $ 3,273  

Zero-coupon promissory notes

    230       224  

Debentures

    549       528  

Senior promissory notes

    1,758       1,746  

Long-term promissory note

    100       96  

Less unamortized discount

    (175     —    
   

 

 

   

 

 

 

Net liabilities

  $ 5,752     $ 5,867