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Note 3 - Acquisitions for Units (Details Textual)
$ in Thousands
 3 Months Ended 9 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
Sep. 30, 2022
USD ($)
a
shares
Sep. 30, 2021
USD ($)
shares
Number Of Counties In Which Entity Operates 592       592  
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received         $ 1,825 $ 563
Oil and Gas Property, Full Cost Method, Net $ 117,936   $ 98,319   $ 117,936  
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   725,000
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable       $ 12,200   $ 12,200
Oil and Gas Property, Full Cost Method, Net     $ 11,500      
Asset Acquisition, Consideration Transferred, Transaction Cost           $ 600
Excess Energy, LLC [Member] | dmlp_Mineral And Royalty Interest [Member]            
Area of Real Estate Property (Acre) | a 2,100       2,100  
Number Of Counties In Which Entity Operates 12       12  
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares 816,719       816,719  
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable $ 20,400       $ 20,400  
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received 900       900  
Oil and Gas Property, Full Cost Method, Net 19,100       19,100  
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     570,000  
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable   $ 14,800     $ 14,800  
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received         800  
Oil and Gas Property, Full Cost Method, Net $ 14,000       14,000  
Gemini 5 Thirty, LP [Member] | dmlp_Mineral And Royalty Interest [Member]            
Area of Real Estate Property (Acre) | a     4,600      
Number Of Counties In Which Entity Operates     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      
Oil and Gas Property, Full Cost Method, Net     $ 29,300      
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