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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income Taxes [Abstract] |  |
Net operating loss carryforwards | $ 9,596 | $ 9,119
Oil and gas properties | 922 | 1,054
Property, Plant and Equipment | 1 |
Property, Plant and Equipment |  | (5)
Asset retirement obligation | 542 | 500
Tax credits |  | 65
Miscellaneous | 29 | 36
Valuation allowance | (11,090) | (10,704)
Net deferred tax asset |  | $ 65

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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