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TRADE RECEIVABLES (Tables)
12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Schedule of Trade Receivables, Net
Trade receivables, net, at December 31, consisted of the following:
20202019
(thousands of dollars)
Trade receivables$25,601 $26,749 
Less allowance for doubtful accounts(300)(429)
Trade receivables, net$25,301 $26,320