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Note 3 - Acquisitions for Units (Details Textual) $ in Thousands				6 Months Ended		12 Months Ended
	Jul. 12, 2023 USD ($) a shares	Sep. 30, 2022 USD ($) a shares	Mar. 31, 2022 USD ($) a shares	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Number Of Counties In Which Entity Operates				592
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received				$ 549	$ 1,003
Oil and Gas Property, Full Cost Method, Net, Total				100,357		$ 112,250
Subsequent Event [Member]
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable	$ 11,000
dmlp_Mineral And Royalty Interest [Member] | Partnership Interest [Member]
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received					$ 900
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
Excess Energy, LLC [Member] | dmlp_Mineral And Royalty Interest [Member] | Subsequent Event [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
Unrelated Third Parties [Member] | dmlp_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
Oil and Gas Property, Full Cost Method, Net, Total						$ 14,000

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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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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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-Publisher FASB
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