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Note 3 - Acquisitions for Common Units (Details Textual)
$ in Thousands
 3 Months Ended
Mar. 28, 2024
USD ($)
a
shares
Sep. 29, 2023
USD ($)
a
shares
Aug. 31, 2023
USD ($)
a
shares
Jul. 12, 2023
USD ($)
a
shares
Sep. 30, 2022
USD ($)
a
shares
Mar. 31, 2024
USD ($)
Mar. 25, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Number Of Counties In Which Entity Operates           594      
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received           $ 4,157   $ 550  
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion           125,039     $ 120,118
Multiple Unrelated Third Party [Member] | Mineral And Royalty Interest [Member]                  
Area of Real Estate Property (Acre) | a 1,485                
Number Of Counties In Which Entity Operates 2                
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares 505,369                
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable $ 17,000                
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received           4,000 $ 4,000    
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion           12,000      
Multiple Unrelated Third Party [Member] | Mineral And Royalty Interest [Member] | TEXAS                  
Area of Real Estate Property (Acre) | a     568            
Number Of Counties In Which Entity Operates     3            
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares     374,000            
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable     $ 10,400            
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received           $ 200      
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion                 10,100
An Unrelated Third Party [Member] | Mineral And Royalty Interest [Member]                  
Area of Real Estate Property (Acre) | a   716              
Number Of Counties In Which Entity Operates   3              
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares   494,000              
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable   $ 14,400              
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion                 13,400
Excess Energy, LLC [Member] | Mineral And Royalty Interest [Member]                  
Area of Real Estate Property (Acre) | a       900 2,100        
Number Of Counties In Which Entity Operates       13 12        
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares       343,750 816,719        
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable       $ 11,000 $ 20,400        
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion                 $ 10,400
Unrelated Third Parties [Member] | Mineral And Royalty Interest [Member] | Excess [Member]                  
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received               $ 500