Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Computed expected tax expense (benefit)	$ (157,000)	$ 77,000	$ 78,000
Miscellaneous timing differences related to book and tax depletion differences and the expensing of intangible drilling costs	(9,000)	(233,000)	(89,000)
NOL Carryforward			(106,000)
Gain on sale of oil and gas properties'	193,000	303,000	235,000
Expired and surrendered leases			(74,000)
Correction of prior year estimate	12,000	77,000
Expected Federal income tax expense (benefit)	39,000	224,000	44,000
Current income tax provision (benefit)	$ 39,000	$ 224,000	$ 44,000