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Condensed Consolidated Income Statements (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Operating revenues:    
Operating revenues $ 40,401 $ 17,789
Costs and expenses:    
Operating, including production taxes 3,268 1,521
Depreciation, depletion and amortization 4,466 2,298
General and administrative 2,043 2,169
Total costs and expenses 9,777 5,988
Net income 30,624 11,801
Allocation of net income:    
General partner 1,082 397
Unitholders $ 29,542 $ 11,404
Net income per common unit (basic and diluted) (in dollars per share) $ 0.80 $ 0.33
Weighted average basic and diluted common units outstanding (in shares) 36,991 34,680
Royalties [Member]    
Operating revenues:    
Operating revenues $ 34,879 $ 14,371
Net Profits Interest [Member]    
Operating revenues:    
Operating revenues 5,470 2,975
Lease Bonus and Other [Member]    
Operating revenues:    
Operating revenues $ 52 $ 443