Quarterly report pursuant to sections 13 or 15(d)

TRADE RECEIVABLES

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TRADE RECEIVABLES
3 Months Ended
Mar. 31, 2013
TRADE RECEIVABLES [Abstract]  
TRADE RECEIVABLES
5. TRADE RECEIVABLES

Trade receivables, net, at March 31, 2013, and December 31, 2012, consisted of the following:

   
March 31, 2013
   
December 31, 2012
 
   
(thousands of dollars)
 
Trade receivables
  $ 20,218     $ 16,012  
Less allowance for doubtful accounts
    (210 )     (210 )
    Trade receivables, net
  $ 20,008     $ 15,802  

Trade receivables serving as collateral for the Company's line of credit with a domestic bank were $15.6 million and $11.7 million at March 31, 2013, and December 31, 2012, respectively (see Note 9).