Supplemental Oil And Gas Information (Schedule Of Capitalized Costs Related To Oil And Gas Producing Activities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Supplemental Oil And Gas Information [Abstract]
Oil and gas properties	$ 6,752	$ 6,751
Ceiling test impairment	(3,855)
Oil and gas properties, net of ceiling test impairment	2,897	6,751
Unevaluated properties
Accumulated depreciation, depletion and amortization	(2,935)	(2,366)
Ceiling test impairment	2,935
Accumulated depreciation, depletion and amortization, net of ceiling test impairment		(2,366)
Oil and gas properties, net	$ 2,897	$ 4,385

Capitalized Costs, Accumulated Depreciation, Depletion, Amortization and Valuation Allowance, Ceiling Test Impairment

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Capitalized Costs, Accumulated Depreciation, Depletion, Amortization and Valuation Allowance, Ceiling Test Impairment, Net

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Capitalized Costs, Ceiling Test Impairment

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Capitalized Costs, Proved Properties, Net

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Supplemental Oil And Gas Information [Abstract]

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Amount of accumulated depreciation, depletion, amortization and valuation allowance relating to oil and gas producing activities.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447

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Net amount of capitalized costs relating to oil and gas producing activities.

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Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table.

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Capitalized costs of unproved properties incurred for any combination mineral interests acquisitions and other costs not previously disclosed within this table.

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