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Note 14 - Major Customers - Concentration Risk (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2024

Dec. 31, 2023

Dec. 31, 2022

Alpha Metallurgical Resources [Member]

Net sales

^[1]

$ 67,714

$ 86,118

$ 102,352

Alpha Metallurgical Resources [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]

Revenue, percent

^[1]

28.00%

23.00%

26.00%

Foresight [Member]

Net sales

^[1]

$ 39,178

$ 60,495

$ 65,597

Foresight [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]

Revenue, percent

^[1]

16.00%

16.00%

17.00%

Alabama Kanu Holdings [Member]

Net sales

^[1],[2]

$ 29,533

$ 34,869

$ 24,596

Alabama Kanu Holdings [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]

Revenue, percent

^[1],[2]

12.00%

9.00%

6.00%

[1]	Revenues from Alpha Metallurgical Resources, Inc., Foresight and Alabama Kanu Holdings, LLC are included within the Partnership's Mineral Rights segment.
[2]	Alabama Kanu Holdings, LLC purchased Hatfield Metallurgical Holdings, LLC in August 2024.

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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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