Cash Flow Information - Cash Flow (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net cash provided by operating activities includes cash payments for the following:
Income taxes	$ 60,000	$ 200,000	$ 130,000
Excluded from the Consolidated Statements of Cash Flows were the effects of certain non-cash investing and financing activities, as follows:
Addition (Reductions) of oil & gas properties by recognitions of asset retirement obligation	(36,000)	(45,000)	251,184
Proceeds from sales of oil and gas properties	1,168,000	965,000	4,767,000
Capital acquisition under IRC Section 1031		(21,000)	(3,228,000)
Qualified Intermediary accounts receivable	(250,000)	579,000	(579,000)
Negotiated settlements			(26,000)
Non-cash investing and financing activities	$ 918,000	$ 1,523,000	$ 934,000