Condensed Consolidated Income Statements (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating revenues
Operating revenues	$ 40,167	$ 40,401
Costs and expenses
Operating, including production taxes	2,718	3,268
Depreciation, depletion and amortization	6,641	4,466
General and administrative	2,738	2,043
Total costs and expenses	12,097	9,777
Net income	28,070	30,624
Allocation of net income
General partner	760	1,082
Unitholders	$ 27,310	$ 29,542
Net income per common unit (basic and diluted) (in dollars per share)	$ 0.71	$ 0.80
Weighted average basic and diluted common units outstanding (in shares)	38,372	36,991
Royalties [Member]
Operating revenues
Operating revenues	$ 24,684	$ 34,879
Net Profit Interests [Member]
Operating revenues
Operating revenues	14,947	5,470
Lease Bonus and Other [Member]
Operating revenues
Operating revenues	$ 536	$ 52