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Condensed Consolidated Income Statements (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating revenues:    
Operating revenues $ 17,789 $ 15,476
Costs and expenses:    
Operating, including production taxes 1,521 1,440
Depreciation, depletion and amortization 2,298 3,357
General and administrative expenses 2,169 1,918
Total costs and expenses 5,988 6,715
Net income 11,801 8,761
Allocation of net income:    
General Partner 397 238
Unitholders $ 11,404 $ 8,523
Net income per common unit (basic and diluted) (in dollars per share) $ 0.33 $ 0.25
Weighted average basic and diluted common units outstanding (in shares) 34,680 34,680
Royalty [Member]    
Operating revenues:    
Operating revenues $ 14,371 $ 9,950
Net Profit Interests [Member]    
Operating revenues:    
Operating revenues 2,975 5,168
Lease Bonus [Member]    
Operating revenues:    
Operating revenues $ 443 $ 358