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Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2013
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 March 31, 2013, are as follows (in thousands):

 

                 
    Carrying     Estimated  
    Amount     Fair Value  

Promissory notes

  $ 2,880     $ 2,853  

Zero-coupon promissory notes

    230       225  

Debentures

    537       534  

Senior promissory notes

    1,771       1,770  

Long-term promissory notes

    125       121  

Less: unamortized discount

    (39     —    
   

 

 

   

 

 

 

Net liabilities

  $ 5,504     $ 5,503