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TRADE RECEIVABLES (Tables)
12 Months Ended
Dec. 31, 2012
TRADE RECEIVABLES [Abstract]  
Trade Receivables
Trade receivables, net, at December 31, 2012, and 2011, respectively, consisted of the following:

   
2012
  
2011
 
   
(thousands of dollars)
 
        
Trade receivables
 $16,012  $23,408 
Less allowance for doubtful accounts
  (210)  (210)
          
Trade receivables, net
 $15,802  $23,198