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Note 3 - Acquisitions for Units (Details Textual) $ in Thousands			3 Months Ended		6 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, 2022 USD ($)	Jun. 30, 2021 USD ($) a
Number Of Counties In Which Entity Operates					590
Oil and Gas Property, Full Cost Method, Net, Total	$ 98,319			$ 98,319	$ 102,873
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received					1,003	$ 352
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, Transaction Cost						$ 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
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
Oil and Gas Property, Full Cost Method, Net, Total	$ 29,300			$ 29,300
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received				$ 1,900
Asset Acquisition, Consideration Transferred, Transaction Cost					$ 100
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
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