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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 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 September 30, 2012, are as follows (in thousands):

 

                 
    Carrying     Estimated  
    Amount     Fair Value  

Promissory notes

  $ 3,280     $ 3,246  

Zero-coupon promissory notes

    230       225  

Debentures

    549       546  

Senior promissory notes

    1,759       1,753  

Long-term promissory note

    125       119  

Less unamortized discount

    (133     —    
   

 

 

   

 

 

 

Net liabilities

  $ 5,810     $ 5,889