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Condensed Consolidated Income Statements (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Operating revenues:        
Operating revenues $ 53,472 $ 42,594 $ 121,811 $ 113,380
Costs and expenses:        
Operating, including production taxes 4,135 3,714 10,273 9,186
Depreciation, depletion and amortization 10,041 6,619 24,627 18,597
General and administrative 2,883 2,798 8,703 8,260
Total costs and expenses 17,059 13,131 43,603 36,043
Net income 36,413 29,463 78,208 77,337
Allocation of net income:        
General Partner 1,273 1,029 2,704 2,445
Unitholders $ 35,140 $ 28,434 $ 75,504 $ 74,892
Net income per common unit (basic and diluted) (in dollars per share) $ 0.87 $ 0.73 $ 1.89 $ 1.94
Weighted average basic and diluted common units outstanding (in shares) 40,167 38,792 39,954 38,514
Royalties [Member]        
Operating revenues:        
Operating revenues $ 45,147 $ 35,790 $ 101,660 $ 84,087
Net Profit Interests [Member]        
Operating revenues:        
Operating revenues 7,777 6,033 18,619 26,810
Lease Bonus and Other [Member]        
Operating revenues:        
Operating revenues $ 548 $ 771 $ 1,532 $ 2,483