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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Income Taxes [Abstract] |  |
Net operating loss carryforwards | $ 9,119 | $ 9,675
Oil and gas properties | 1,054 | 1,327
Property, Plant and Equipment | (5) | (163)
Asset retirement obligation | 500 | 592
Tax credits | 65 | 130
Miscellaneous | 36 | 45
Valuation allowance | (10,704) | (11,476)
Net deferred tax asset | $ 65 | $ 130

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