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Note 3 - Acquisitions for Units (Details Textual) $ in Thousands						12 Months Ended
	Sep. 29, 2023 USD ($) a shares	Aug. 31, 2023 USD ($) a shares	Jul. 12, 2023 USD ($) a shares	Sep. 30, 2022 USD ($) a shares	Mar. 31, 2022 USD ($) a shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Number Of Counties In Which Entity Operates						593
Oil and Gas Property, Full Cost Method, Net						$ 120,118	$ 112,250
An Unrelated Third Party [Member] | Mineral And Royalty Interest [Member]
Area of Real Estate Property (Acre) | a	716
Number Of Counties In Which Entity Operates	3
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares	494,000
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable	$ 14,400
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received						900
Oil and Gas Property, Full Cost Method, Net						13,400
Multiple Unrelated Third Party [Member] | Mineral And Royalty Interest [Member]
Area of Real Estate Property (Acre) | a		568
Number Of Counties In Which Entity Operates		3
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares		374,000
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable		$ 10,400
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received						300
Oil and Gas Property, Full Cost Method, Net						10,100
Excess Energy, LLC [Member] | Mineral And Royalty Interest [Member]
Area of Real Estate Property (Acre) | a			900	2,100
Number Of Counties In Which Entity Operates			13	12
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares			343,750	816,719
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable			$ 11,000	$ 20,400
Oil and Gas Property, Full Cost Method, Net						10,400	19,000
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received, Net							900
Costs Incurred, Acquisition of Unproved Oil and Gas Properties							1,800
Multiple Related Parties for the Acquisition Closed on July 12, 2023 [Member] | Mineral And Royalty Interest [Member]
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received, Net						500
Unrelated Third Parties [Member] | Mineral And Royalty Interest [Member]
Area of Real Estate Property (Acre) | a					3,600
Number Of Counties In Which Entity Operates					13
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares					570,000
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable					$ 14,800
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received							800
Oil and Gas Property, Full Cost Method, Net							$ 14,000
Unrelated Third Parties [Member] | Mineral And Royalty Interest [Member] | Excess [Member]
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received						$ 500

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480060/805-50-25-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 30
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480027/805-50-30-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 30
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480027/805-50-30-2

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Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 19
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482274/932-235-50-19

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-Topic 932
-SubTopic 235
-Section 50
-Paragraph 18
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482274/932-235-50-18

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