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Condensed Consolidated Income Statements (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net operating revenues:        
Operating revenues $ 23,969 $ 12,545 $ 63,119 $ 34,816
Costs and expenses:        
Operating, including production taxes 2,126 1,532 5,291 4,322
Depreciation, depletion and amortization 2,902 3,161 7,684 9,458
General and administrative expenses 910 2,233 3,803 5,464
Total costs and expenses 5,938 6,926 16,778 19,244
Net income 18,031 5,619 46,341 15,572
Allocation of net income:        
General partner 631 192 1,579 490
Unitholders $ 17,400 $ 5,427 $ 44,762 $ 15,082
Net income per common unit (basic and diluted) (in dollars per share) $ 0.49 $ 0.16 $ 1.28 $ 0.43
Weighted average basic and diluted common units outstanding (in shares) 35,405 34,680 34,927 34,680
Royalty [Member]        
Net operating revenues:        
Operating revenues $ 20,031 $ 10,740 $ 51,172 $ 27,195
Net Profit Interests [Member]        
Net operating revenues:        
Operating revenues 3,493 1,681 10,692 7,127
Lease Bonus [Member]        
Net operating revenues:        
Operating revenues 12 12 456 281
Product and Service, Other [Member]        
Net operating revenues:        
Operating revenues $ 433 $ 112 $ 799 $ 213