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Description Of Business And Significant Accounting Policies (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Mar. 27, 2020
Description Of Business And Significant Accounting Policies [Line Items]
Unevaluated properties	$ 0		$ 0		$ 0
Impairment			0	$ 0
Accounts receivable - current	422,000		422,000		557,000
Allowance for doubtful accounts	0		0		0
Revenue	563,000	$ 1,390,000	1,526,000	$ 2,562,000
Tax [Member]
Description Of Business And Significant Accounting Policies [Line Items]
Accounts receivable - current	130,000		130,000		65,000	$ 65,000
Accounts receivable - noncurrent	$ 0		0		65,000
Natural Gas Imbalances [Member]
Description Of Business And Significant Accounting Policies [Line Items]
Revenue			$ 0		$ 0

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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