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Consolidated Income Statements - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Operating revenues:    
Operating revenues $ 93,423 $ 46,928
Costs and expenses    
Production taxes 3,667 1,813
Operating expenses 3,929 3,880
Depreciation, depletion and amortization 10,464 11,909
General and administrative expenses 5,189 7,459
Total costs and expenses 23,249 25,061
Net income 70,174 21,867
Allocation of net income:    
General Partner 2,348 705
Unitholders $ 67,826 $ 21,162
Net income per common unit (basic and diluted) (in dollars per share) $ 1.94 $ 0.61
Weighted average basic and diluted common units outstanding (in shares) 35,052 34,680
Royalty [Member]    
Operating revenues:    
Operating revenues $ 73,985 $ 37,043
Net Profit Interests [Member]    
Operating revenues:    
Operating revenues 17,596 8,714
Lease Bonus [Member]    
Operating revenues:    
Operating revenues 829 291
Product and Service, Other [Member]    
Operating revenues:    
Operating revenues $ 1,013 $ 880