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Supplemental Oil And Gas Information (Schedule Of Changes In The Standardized Measure Of Discounted Future Net Cash Flows From Proved Oil And Gas Reserves) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Supplemental Oil And Gas Information [Abstract] |  |  |
Balance, beginning of year | $ 8,365 | $ 13,976 | $ 8,170
Sales, net of production costs and taxes | (210) | (1,646) | (2,611)
Discoveries and extensions, net of costs |  | 154 | 798
Purchase of reserves in place |  |  | 143
Sale of reserves in place |  | (26) |
Net changes in prices and production costs | (2,893) | (3,348) | 4,304
Revisions of quantity estimates | (2,353) | (3,058) | 2,180
Previously estimated development cost incurred during the year |  |  | 210
Changes in future development costs | (314) | 1,016 | 78
Changes in timing and other | (389) | 86 | (4)
Accretion of discount | 691 | 1,211 | 708
Net change in income taxes |  |  |
Balance, end of year | $ 2,897 | $ 8,365 | $ 13,976

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- Definition Amount of decrease in standardized measure of discounted future net cash flow as a result of sales of minerals in place. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35A -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6807758-109447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63123-109448 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62500-109447 + Details
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