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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Income Taxes [Abstract] |  |
Bad debt |  |
Valuation allowance |  |
Total deferred tax assets - current |  |
Net operating loss carryforwards | 9,675 | 8,187
Oil and gas properties | 1,327 | 2,735
Property, Plant and Equipment |  | 419
Property, Plant and Equipment | (163) |
Asset retirement obligation | 592 | 616
Tax credits | 130 | 260
Miscellaneous | 45 | 92
Valuation allowance | (11,476) | (12,067)
Total deferred tax assets - noncurrent | 130 | 242
Net deferred tax asset | $ 130 | $ 242

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