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Note 2 - Acquisitions for Units (Details Textual) $ in Thousands					12 Months Ended
	Sep. 30, 2022 USD ($) a shares	Mar. 31, 2022 USD ($) a shares	Dec. 31, 2021 USD ($) a shares	Jun. 30, 2021 USD ($) a shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) a
Number Of Counties In Which Entity Operates					592
Oil and Gas Property, Full Cost Method, Net, Total			$ 98,319		$ 112,250	$ 98,319
Royalty Interests in Bakken Trend [Member] | Partnership Interest [Member]
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares				725,000
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable				$ 12,200
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received						700
Oil and Gas Property, Full Cost Method, Net, Total			$ 11,500			$ 11,500
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					900
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
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, Total					14,000
Gemini 5 Thirty, LP [Member] | dmlp_Mineral And Royalty Interest [Member]
Area of Real Estate Property (Acre) | a			4,600			4,600
Number Of Counties In Which Entity Operates			27			27
Gemini 5 Thirty, LP [Member] | Mineral and Royalty Interests [Member]
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares			1,580,000
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable			$ 31,300
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received					$ 400	$ 1,600
Oil and Gas Property, Full Cost Method, Net, Total			$ 29,300			$ 29,300
JSFM, LLC [Member] | Property Located in Dunn, McKenzie, McLean and Mountrail Counties, North Dakota [Member]
Area of Real Estate Property (Acre) | a				6,400

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 30
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126928898&loc=d3e9215-128498

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-Publisher FASB
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-SubTopic 235
-Section 50
-Paragraph 18
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