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Note 2 - Acquisition for Units (Details Textual) $ in Thousands			3 Months Ended		12 Months Ended
	Dec. 31, 2021 USD ($) a shares	Jun. 30, 2021 USD ($) a shares	Dec. 31, 2021 USD ($) a	Jun. 30, 2021 USD ($) a	Dec. 31, 2021 USD ($) a	Dec. 31, 2020 USD ($)
Number Of Counties In Which Entity Operates	582		582		582
Oil and Gas Property, Full Cost Method, Net, Total	$ 98,319		$ 98,319		$ 98,319	$ 67,963
Royalty Interests in Bakken Trend [Member]
Asset Acquisition, Consideration Transferred, Transaction Cost					700
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		$ 11,500
Asset Acquisition, Consideration Transferred, Royalty Revenue Received				$ 400
Gemini 5 Thirty, LP [Member] | dmlp_Mineral And Royalty Interest [Member]
Area of Real Estate Property (Acre) | a	4,600		4,600		4,600
Number Of Counties In Which Entity Operates	27		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			$ 1,900
Asset Acquisition, Consideration Transferred, Transaction Cost	1,600
Oil and Gas Property, Full Cost Method, Net, Total	$ 29,300		$ 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		6,400

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 30
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123362884&loc=d3e9215-128498

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