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Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Accounts Payable and Accrued Liabilities    
Accounts payable $ 652 $ 396
Accrued payroll liabilities 1,829 1,767
Accrued severance, ad valorem, and other taxes payable 199 157
Accounts payable and accrued liabilities $ 2,680 $ 2,320