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Supplemental Oil and Gas Disclosures (Unaudited) (Future Net Cash Flows From Proved Oil and Gas Reserves) (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Gross Amounts |  |  |
Future cash inflows | $ 122,286 | $ 218,982 |
Future production costs | 27,487 | 39,841 |
Future net cash flows before income tax expense | 94,799 | 179,141 |
10% discount to reflect timing of cash flows | (33,521) | (62,615) |
Standardized measure of discounted cash flows | 61,278 | 116,526 | $ 36,839
Net Amounts |  |  |
Future net cash flows before income tax expense | 74,891 | 141,521 |
10% discount to reflect timing of cash flows | (26,481) | (49,465) |
Standardized measure of discounted cash flows | $ 48,410 | $ 92,056 |

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- Definition Amount of estimated future accumulated cash inflow from the sale of proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Form 20-F -Section Item 18 -Subsection Instruction 2 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 55 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482245/932-235-55-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 33 -SubTopic 235 -Topic 932 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482274/932-235-50-33 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 31 -Subparagraph (a) -SubTopic 235 -Topic 932 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482274/932-235-50-31 + Details
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