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Note 2 - Acquisitions for Units (Details Textual) $ in Thousands			3 Months Ended
	Dec. 31, 2021 USD ($) a shares	Jun. 30, 2021 USD ($) a shares	Mar. 31, 2022 USD ($) a shares	Dec. 31, 2021 USD ($) a	Jun. 30, 2021 USD ($) a	Mar. 31, 2021 USD ($)
Number Of Counties In Which Entity Operates			590
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received			$ 747			$ 0
Oil and Gas Property, Full Cost Method, Net, Total	$ 98,319		$ 107,654	$ 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
Oil and Gas Property, Full Cost Method, Net, Total	$ 11,500			$ 11,500
Asset Acquisition, Consideration Transferred, Royalty Revenue Received					$ 400
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			700
Oil and Gas Property, Full Cost Method, Net, Total			13,800
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	$ 1,900
Oil and Gas Property, Full Cost Method, Net, Total	$ 29,300			$ 29,300
Asset Acquisition, Consideration Transferred, Transaction Cost			$ 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			6,400

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-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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