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ACCRUED LIABILITIES (Tables)
3 Months Ended
Mar. 31, 2021
Accrued Liabilities [Abstract]  
Schedule of Accrued Liabilities
Accrued liabilities consisted of the following:
 March 31, 2021December 31, 2020
 (thousands of dollars)
State taxes$45 $125 
Property taxes906 — 
Payroll2,104 2,282 
Royalties391 260 
Officer compensation368 1,053 
Foreign taxes— 1,054 
AMAK transaction costs— 559 
Other2,188 1,524 
Total accrued liabilities$6,002 $6,857