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Note 5 - Oil and Natural Gas Production Activities (Details Textual) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2022 USD ($) a | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) $ / bbl $ / MMBTU | Sep. 30, 2022 USD ($)
Proceeds from Sale of Oil and Gas Property and Equipment |  |  |  | $ 0 | $ 1,250
Impairment of Oil and Gas Properties |  | $ 6,495 | $ 0 | $ 6,495 | $ 0
Oil and Gas Property, Ceiling Test, Discount Rate |  |  |  | 10.00% |
Crude Oil [Member] |  |  |  |  |
Oil and Gas, Average Sale Price (in USD per Barrel of Oil) | $ / bbl |  |  |  | 78.53 |
Natural Gas and Natural Gas Liquids [Member] |  |  |  |  |
Oil and Gas, Average Sale Price (in USD per Barrel of Oil) | $ / MMBTU |  |  |  | 3.43 |
Unproven Properties Transferred to Evaluated Properties [Member] |  |  |  |  |
Impairment of Oil and Gas Properties |  |  |  | $ 1,600 |
Non-Operated Wells in Zavala County, Texas [Member] |  |  |  |  |
Proceeds from Sale of Oil and Gas Property and Equipment | $ 1,100 |  |  |  |
Area of Land (Acre) | a | 4,500 |  |  |  |

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- Definition Sales price per unit of oil and gas produced. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Regulation S-K (SK) -Number 229 -Section 1204 -Paragraph (b) -Subparagraph (1) -Publisher SEC + Details
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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482450/932-360-35-11 + Details
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- Definition The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 12 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-12 + Details
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