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Note 3 - Acquisitions for Common Units (Details Textual) $ in Thousands			3 Months Ended
	Sep. 30, 2024 USD ($) a shares	Mar. 28, 2024 USD ($) a shares	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Mar. 25, 2024 USD ($)	Dec. 31, 2024 USD ($)
Number Of Counties In Which Entity Operates			594
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion			$ 279,673			$ 298,011
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received			1,938	$ 4,157
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
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion						193,700
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received			$ 1,900
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
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
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion						$ 12,300
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received				$ 4,000	$ 4,000

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+ References

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The number of counties the entity operates in.

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Area of a real estate property.

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Amount of acquirer's equity interest issued and issuable as part of consideration transferred in asset acquisition.

+ 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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- Definition

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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