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Condensed Consolidated Income Statements (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Net operating revenues:        
Operating revenues $ 12,545 $ 19,569 $ 34,816 $ 59,200
Costs and expenses:        
Operating, including production taxes 1,532 1,380 4,322 4,781
Depreciation, depletion and amortization 3,161 3,628 9,458 9,865
General and administrative expenses 2,233 1,694 5,464 4,112
Total costs and expenses 6,926 6,702 19,244 18,758
Net income 5,619 12,867 15,572 40,442
Allocation of net income:        
General partner 192 463 490 1,364
Unitholders $ 5,427 $ 12,404 $ 15,082 $ 39,078
Net income per common unit (basic and diluted) (in dollars per share) $ 0.16 $ 0.35 $ 0.43 $ 1.15
Weighted average basic and diluted common units outstanding (in shares) 34,680 34,680 34,680 33,960
Royalty [Member]        
Net operating revenues:        
Operating revenues $ 10,740 $ 14,075 $ 27,195 $ 44,629
Net Profit Interests [Member]        
Net operating revenues:        
Operating revenues 1,681 2,259 7,127 10,523
Lease Bonus [Member]        
Net operating revenues:        
Operating revenues 12 3,147 281 3,569
Product and Service, Other [Member]        
Net operating revenues:        
Operating revenues $ 112 $ 88 $ 213 $ 479