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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

X

- 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

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X

- Definition

Area of land held.

+ References

No definition available.

+ Details

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X

- 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

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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

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- Definition

Represents the discount rate used in a ceiling test for oil and gas property.

+ References

No definition available.

+ Details

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