Quarterly report pursuant to Section 13 or 15(d)

TRADE RECEIVABLES

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TRADE RECEIVABLES
 6 Months Ended
Jun. 30, 2016
TRADE RECEIVABLES [Abstract]  
TRADE RECEIVABLES
3. TRADE RECEIVABLES

Trade receivables, net, consisted of the following:

   
June 30, 2016
    
December 31, 2015
  
   
(thousands of dollars)
  
Trade receivables
  
$
17,881
    
$
19,684
  
Less allowance for doubtful accounts
    
(300
)
    
(210
)
Trade receivables, net
  
$
17,581
    
$
19,474
  

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