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Note 3 - Acquisitions for Units (Details Textual) $ in Thousands			3 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($) a shares	Mar. 31, 2022 USD ($) a shares	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($) a	Dec. 31, 2022 USD ($)
Number Of Counties In Which Entity Operates			592
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received			$ 550	$ 747
Oil and Gas Property, Full Cost Method, Net, Total			105,670		$ 112,250
Royalty Interests in Bakken Trend [Member] | Partnership Interest [Member]
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received				$ 700
Excess Energy, LLC [Member] | dmlp_Mineral And Royalty Interest [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
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received			$ 500
Oil and Gas Property, Full Cost Method, Net, Total					19,000
Costs Incurred, Acquisition of Unproved Oil and Gas Properties					1,800
Unrelated Third Parties [Member] | dmlp_Mineral And Royalty Interest [Member]
Area of Real Estate Property (Acre) | a		3,600		3,600
Number Of Counties In Which Entity Operates		13		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
Oil and Gas Property, Full Cost Method, Net, Total					$ 14,000

X

- Definition

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+ References

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- Definition

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- Definition

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- Definition

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

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

+ References

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
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482274/932-235-50-18

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Oil and gas properties, net of depletion, carried under the full cost method.

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