Quarterly report pursuant to Section 13 or 15(d)

TRADE RECEIVABLES

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TRADE RECEIVABLES
3 Months Ended
Mar. 31, 2018
TRADE RECEIVABLES [Abstract]  
TRADE RECEIVABLES
3. TRADE RECEIVABLES

Trade receivables, net, consisted of the following:

   
March 31, 2018
   
December 31, 2017
 
   
(thousands of dollars)
 
Trade receivables
 
$
27,849
   
$
26,079
 
Less allowance for doubtful accounts
   
(428
)
   
(300
)
    Trade receivables, net
 
$
27,421
   
$
25,779
 

Trade receivables serves as collateral for our amended and restated credit agreement. See Note 10.