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ACCRUED LIABILITIES
 6 Months Ended
Jun. 30, 2021
Accrued Liabilities [Abstract]  
ACCRUED LIABILITIES ACCRUED LIABILITIES
Accrued liabilities consisted of the following:
 June 30, 2021December 31, 2020
 (thousands of dollars)
State taxes$107 $125 
Property taxes1,772 — 
Payroll1,615 2,282 
Royalties526 260 
Officer compensation766 1,053 
AMAK foreign taxes and transaction costs— 1,613 
Other2,602 1,524 
Total accrued liabilities$7,388 $6,857