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Consolidated Income Statements (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Operating revenues    
Operating revenues $ 58,875 $ 43,164
Costs and expenses    
Operating, including production taxes 4,567 4,447
Depreciation, depletion and amortization 20,907 16,759
Total costs and expenses 29,738 25,522
Net income 29,137 17,642
Allocation of net income    
General Partner 877 632
Unitholders $ 28,260 $ 17,010
Net income per common unit (basic and diluted) (in dollars per share) $ 0.59 $ 0.36
Weighted average basic and diluted common units outstanding (in shares) 48,256 47,340
Nonrelated Party [Member]    
Costs and expenses    
General and administrative $ 1,261 $ 1,379
Related Party [Member]    
Costs and expenses    
General and administrative 3,003 2,937
Royalties [Member]    
Operating revenues    
Operating revenues 40,965 37,830
Net Profit Interests [Member]    
Operating revenues    
Operating revenues 16,529 4,793
Lease Bonus [Member]    
Operating revenues    
Operating revenues 849 111
Other Revenue [Member]    
Operating revenues    
Operating revenues $ 532 $ 430