Supplemental Oil And Gas Information (Schedule Of Results Of Operations From Oil And Gas Producing Activities) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Supplemental Oil And Gas Information [Abstract]
Revenues	$ 3,038	$ 4,911
Production costs and taxes	(3,104)	(3,398)
Depletion	(569)	(637)
Income (loss) from oil and gas producing activities	$ (635)	$ 876

Supplemental Oil And Gas Information [Abstract]

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Depreciation, depletion and amortization, and valuation provisions (impairments) related to oil and gas producing activities.

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- Definition

Other costs for oil and gas producing activities.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
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The results of operations for oil and gas producing activities, excluding corporate overhead and interest costs.

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Total revenues from oil and gas producing activities.

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