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Note 3 - Acquisitions for Common Units (Details Textual) $ in Thousands							12 Months Ended
	Sep. 30, 2024 USD ($) a shares	Mar. 28, 2024 USD ($) a shares	Sep. 29, 2023 USD ($) a shares	Aug. 31, 2023 USD ($) a shares	Jul. 12, 2023 USD ($) a shares	Sep. 30, 2022 USD ($) a shares	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Number Of Counties In Which Entity Operates							594
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received							$ 14,725	$ 2,284	$ 2,089
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion							298,011	120,118
Multiple Unrelated Third Party [Member] | Mineral and Royalty Interest in New Mexico and Texas [Member]
Area of Real Estate Property (Acre) | a	14,225
Number Of Counties In Which Entity Operates	14
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares	6,721,144
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable	$ 202,600
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received							8,800
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion							193,700
Multiple Unrelated Third Party [Member] | Mineral and Royalty Interest in Weld County, Colorado [Member]
Area of Real Estate Property (Acre) | a	1,204
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares	530,000
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable	$ 16,000
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received							1,400
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion							14,600
Multiple Unrelated Third Party [Member] | Mineral and Royalty Interest in Colorado [Member]
Area of Real Estate Property (Acre) | a		1,485
Number Of Counties In Which Entity Operates		2
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares		505,369
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable		$ 17,000
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received							4,400
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion							12,300
Multiple Unrelated Third Party [Member] | Mineral and Royalty Interest in Texas [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							$ 200	300
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion								10,100
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, Full Cost Method, Property and Equipment, after Accumulated Depletion								13,400
Unrelated Third Parties [Member] | Mineral And Royalty Interest [Member]
Area of Real Estate Property (Acre) | a					900
Number Of Counties In Which Entity Operates					13
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares					343,750
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable					$ 11,000
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received								500
Excess Energy, LLC [Member] | Mineral And Royalty Interest [Member]
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received								500
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion								$ 10,400
Excess Energy, LLC [Member] | Mineral And Royalty Interest [Member] | Excess [Member]
Area of Real Estate Property (Acre) | a						2,100
Number Of Counties In Which Entity Operates						12
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares						816,719
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable						$ 20,400

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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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Amount, after accumulated depletion, of oil and gas properties subject to amortization accounted for under full cost method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 932
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10(c)(7))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479664/932-10-S99-1

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