XML 35 R11.htm IDEA: XBRL DOCUMENT v3.20.4
TRADE RECEIVABLES
 12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
TRADE RECEIVABLES TRADE RECEIVABLES
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 
Accounts receivable serves as collateral for our amended and restated loan agreement with a domestic bank (see Note 13).