Quarterly report pursuant to Section 13 or 15(d)

Accounts Payable and Accrued Liabilities (Details)

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Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accounts Payable and Accrued Liabilities [Abstract]    
Accounts payable $ 862 $ 725
Severance and ad valorem tax payable 1,328 1,649
Payroll and other taxes 1,201 1,251
Accounts payable and accrued liabilities $ 3,391 $ 3,625