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Note 12 - Major Customers - Concentration Risk (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Alpha Metallurgical Resources [Member]
Net sales	[1]	$ 17,219	$ 21,000	$ 61,122	$ 81,638
Alpha Metallurgical Resources [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Revenue, percent (1)	[1]	20.00%	21.00%	22.00%	28.00%
Foresight Energy Resources [Member]
Net sales	[1]	$ 18,600	$ 19,334	$ 43,453	$ 47,081
Foresight Energy Resources [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Revenue, percent (1)	[1]	22.00%	19.00%	16.00%	16.00%
[1] Revenues from Alpha Metallurgical Resources, Inc. and Foresight are included within the Partnership's Mineral Rights segment.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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