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Consolidated Income Statements - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating revenues:    
Operating revenues $ 46,928 $ 78,799
Costs and expenses    
Production taxes 1,813 3,043
Operating expenses 3,880 3,604
Depreciation, depletion and amortization 11,909 13,301
General and administrative expenses 7,459 6,086
Total costs and expenses 25,061 26,034
Net income 21,867 52,765
Allocation of net income:    
General Partner 705 1,733
Unitholders $ 21,162 $ 51,032
Net income per common unit (basic and diluted) (in dollars per share) $ 0.61 $ 1.50
Weighted average basic and diluted common units outstanding (in shares) 34,680 34,126
Royalty [Member]    
Operating revenues:    
Operating revenues $ 37,043 $ 58,759
Net Profit Interests [Member]    
Operating revenues:    
Operating revenues 8,714 15,753
Lease Bonus [Member]    
Operating revenues:    
Operating revenues 291 3,756
Product and Service, Other [Member]    
Operating revenues:    
Operating revenues $ 880 $ 531