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Condensed Consolidated Income Statements (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Operating revenues        
Operating revenues $ 42,594 $ 44,057 $ 113,380 $ 131,917
Costs and expenses        
Operating, including production taxes 3,714 3,184 9,186 10,259
Depreciation, depletion and amortization 6,619 4,247 18,597 13,486
General and administrative 2,798 2,425 8,260 6,023
Total costs and expenses 13,131 9,856 36,043 29,768
Net income 29,463 34,201 77,337 102,149
Allocation of net income        
General Partner 1,029 1,288 2,445 3,623
Unitholders $ 28,434 $ 32,913 $ 74,892 $ 98,526
Net income per common unit (basic and diluted) (in dollars per share) $ 0.73 $ 0.88 $ 1.94 $ 2.64
Weighted average basic and diluted common units outstanding (in shares) 38,792 37,564 38,514 37,372
Royalties [Member]        
Operating revenues        
Operating revenues $ 35,790 $ 33,530 $ 84,087 $ 105,549
Net Profit Interests [Member]        
Operating revenues        
Operating revenues 6,033 2,995 26,810 17,478
Lease Bonus and Other [Member]        
Operating revenues        
Operating revenues $ 771 $ 7,532 $ 2,483 $ 8,890