Quarterly report pursuant to Section 13 or 15(d)

TRADE RECEIVABLES

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TRADE RECEIVABLES
9 Months Ended
Sep. 30, 2016
TRADE RECEIVABLES [Abstract]  
TRADE RECEIVABLES
3. TRADE RECEIVABLES

Trade receivables, net, consisted of the following:

   
September 30, 2016
   
December 31, 2015
 
   
(thousands of dollars)
 
Trade receivables
  $ 20,129     $ 19,684  
Less allowance for doubtful accounts
    (300 )     (210 )
    Trade receivables, net
  $ 19,829     $ 19,474  

Trade receivables serves as collateral for our amended and restated credit agreement. See Note 9.