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TRADE RECEIVABLES
 6 Months Ended
Jun. 30, 2021
Receivables [Abstract]  
TRADE RECEIVABLES TRADE RECEIVABLES
Trade receivables, net consisted of the following:
 June 30, 2021December 31, 2020
 (thousands of dollars)
Trade receivables$34,510 $25,601 
Less allowance for doubtful accounts(300)(300)
Total trade receivables, net$34,210 $25,301 
Trade receivables serve as collateral for our amended and restated credit agreement. See Note 11.