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Condensed Consolidated Income Statements (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net operating revenues:        
Operating revenues $ 6,795 $ 20,600 $ 22,271 $ 39,631
Costs and expenses:        
Operating, including production taxes 1,350 1,789 2,790 3,401
Depreciation, depletion and amortization 2,940 3,930 6,297 6,237
General and administrative expenses 1,313 1,285 3,231 2,418
Total costs and expenses 5,603 7,004 12,318 12,056
Net income 1,192 13,596 9,953 27,575
Allocation of net income:        
General partner 60 455 298 901
Unitholders $ 1,132 $ 13,141 $ 9,655 $ 26,674
Net income per common unit (basic and diluted) (in dollars per share) $ 0.03 $ 0.38 $ 0.28 $ 0.80
Weighted average basic and diluted common units outstanding (in shares) 34,680 34,680 34,680 33,480
Royalty [Member]        
Net operating revenues:        
Operating revenues $ 6,505 $ 15,975 $ 16,455 $ 30,554
Net Profit Interests [Member]        
Net operating revenues:        
Operating revenues 278 3,885 5,446 8,264
Lease Bonus [Member]        
Net operating revenues:        
Operating revenues 6 419 269 422
Product and Service, Other [Member]        
Net operating revenues:        
Operating revenues $ 6 $ 321 $ 101 $ 391