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Income Taxes - Provision for Income Taxes Varies from Federal Statutory Tax Rate (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Expected tax expense $ 1,028 $ 3,676
Revaluation of deferred tax attributes 0 0
Executive Compensation 597 553
State income tax, net of federal benefit (303) 79
Percentage depletion (341) (140)
AMT and Marginal Well Credits 436 (1,186)
Other, net 4 (4)
Total income tax provision (benefit) $ 1,421 $ 2,978