Quarterly report pursuant to sections 13 or 15(d)

TRADE RECEIVABLES (Tables)

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TRADE RECEIVABLES (Tables)
6 Months Ended
Jun. 30, 2012
TRADE RECEIVABLES [Abstract]  
Trade receivables
 
Trade receivables, net, at June 30, 2012, and December 31, 2011, consisted of the following:

   
June 30, 2012
   
December 31, 2011
 
   
(thousands of dollars)
 
Trade receivables
  $ 25,593     $ 23,408  
Less allowance for doubtful accounts
    (210 )     (210 )
    Trade receivables, net
  $ 25,383     $ 23,198  

Trade receivables serving as collateral for the Company's line of credit with a domestic bank were $18.1 million and $16.8 million at June 30, 2012, and December 31, 2011, respectively (see Note 7).