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Note 12 - Major Customers - Concentration Risk (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Alpha Metallurgical Resources [Member]
Net sales	[1]	$ 13,176	$ 20,902
Alpha Metallurgical Resources [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Revenue, percent	[1]	24.00%	27.00%
Foresight Energy Resources [Member]
Net sales		$ 16,460	$ 12,846
Foresight Energy Resources [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Revenue, percent		30.00%	17.00%
[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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