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TRADE RECEIVABLES
 3 Months Ended
Mar. 31, 2022
Receivables [Abstract]  
TRADE RECEIVABLES TRADE RECEIVABLES
Trade receivables, net consisted of the following:
 March 31, 2022December 31, 2021
 (thousands of dollars)
Trade receivables$33,872 $33,111 
Less allowance for doubtful accounts(300)(300)
Total trade receivables, net$33,572 $32,811 
Trade receivables serve as collateral for our amended and restated credit agreement. See Note 10.