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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, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Expected tax expense	$ (595)	$ 1,028
Executive Compensation	703	597
State income tax, net of federal benefit	63	(303)
Percentage depletion	(182)	(341)
AMT and Marginal Well Credits	(502)	436
Other, net	(4)	4
Total income tax provision (benefit)	$ (517)	$ 1,421

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to based alternative minimum tax and marginal well production credits cost.

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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