Quarterly report pursuant to sections 13 or 15(d)

TRADE RECEIVABLES

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TRADE RECEIVABLES
3 Months Ended
Mar. 31, 2014
TRADE RECEIVABLES [Abstract]  
TRADE RECEIVABLES
3. TRADE RECEIVABLES

Trade receivables, net, at March 31, 2014, and December 31, 2013, consisted of the following:

   
March 31, 2014
   
December 31, 2013
 
   
(thousands of dollars)
 
Trade receivables
  $ 24,659     $ 22,279  
Less allowance for doubtful accounts
    (210 )     (210 )
    Trade receivables, net
  $ 24,449     $ 22,069  

Trade receivables serving as collateral for our line of credit with a domestic bank were $19.8 million and $17.7 million at March 31, 2014, and December 31, 2013, respectively (see Note 7).