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Condensed Consolidated Income Statements (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating revenues    
Operating revenues $ 30,979 $ 40,167
Costs and expenses    
Operating, including production taxes 2,623 2,718
Depreciation, depletion and amortization 6,920 6,641
General and administrative 3,269 2,738
Total costs and expenses 12,812 12,097
Net income 18,167 28,070
Allocation of net income    
General Partner 605 760
Unitholders $ 17,562 $ 27,310
Net income per common unit (basic and diluted) (in dollars per share) $ 0.44 $ 0.71
Weighted average basic and diluted common units outstanding (in shares) 39,605 38,372
Royalties [Member]    
Operating revenues    
Operating revenues $ 24,877 $ 24,684
Net Profit Interests [Member]    
Operating revenues    
Operating revenues 5,598 14,947
Lease Bonus and Other [Member]    
Operating revenues    
Operating revenues $ 504 $ 536