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Condensed Consolidated Income Statements (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net operating revenues:        
Operating revenues $ 21,361 $ 6,795 $ 39,150 $ 22,271
Costs and expenses:        
Operating, including production taxes 1,644 1,350 3,165 2,790
Depreciation, depletion and amortization 2,484 2,940 4,782 6,297
General and administrative expenses 724 1,313 2,893 3,231
Total costs and expenses 4,852 5,603 10,840 12,318
Net income 16,509 1,192 28,310 9,953
Allocation of net income:        
General partner 551 60 948 298
Unitholders $ 15,958 $ 1,132 $ 27,362 $ 9,655
Net income per common unit (basic and diluted) (in dollars per share) $ 0.46 $ 0.03 $ 0.79 $ 0.28
Weighted average basic and diluted common units outstanding (in shares) 34,688 34,680 34,684 34,680
Royalty [Member]        
Net operating revenues:        
Operating revenues $ 16,770 $ 6,505 $ 31,141 $ 16,455
Net Profit Interests [Member]        
Net operating revenues:        
Operating revenues 4,224 278 7,199 5,446
Lease Bonus [Member]        
Net operating revenues:        
Operating revenues 7 6 444 269
Product and Service, Other [Member]        
Net operating revenues:        
Operating revenues $ 360 $ 6 $ 366 $ 101