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SUBSEQUENT EVENTS (Details) - USD ($)
6 Months Ended
Aug. 03, 2022
Apr. 29, 2022
Jun. 30, 2022
Jun. 30, 2021
Subsequent events        
Distributions to Class B unitholders     $ 25,821 $ 41,560
Purchase and sale agreement | Royalty, mineral and overriding interests        
Subsequent events        
Total purchase price   $ 14,800,000    
Net proceeds realized   $ 6,400,000    
Subsequent Event | Common Units        
Subsequent events        
Cash distributions declared (in dollars per unit) $ 0.55      
Operating Company | Subsequent Event        
Subsequent events        
Cash distributions declared (in dollars per unit) 0.580177      
Distribution paid corresponding to tax payment (in dollars per unit) $ 0.030177