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ACCRUED LIABILITIES (Tables) | 12 Months Ended
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Dec. 31, 2021
ACCRUED LIABILITIES. |
Accrued liabilities on the balance sheet | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2021 |  | 2020
​ | ​ | (thousands of dollars)
Royalties payable (1) | ​ | $ | 1,151 | ​ | $ | 1,151
Other Accrued Liabilities | ​ | ​ | 978 | ​ | ​ | 1,218
Accrued Liabilities | ​ | $ | 2,129 | ​ | $ | 2,369
(1) | Royalties payable were derived during prior years of production. Liabilities do not accrue interest or have a stated maturity date.

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- Definition Tabular disclosure of the components of accrued liabilities. + References No definition available. + Details
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