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Note 8 - Mineral Rights, Net - Composition of Mineral Rights (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Mineral Properties, carrying value	$ 687,959	$ 695,113
Mineral Properties, accumulated depletion	(310,714)	(315,475)
Mineral Properties, net book value	377,245	379,638
Coal Properties [Member]
Mineral Properties, carrying value	653,808	660,961
Mineral Properties, accumulated depletion	(294,522)	(299,404)
Mineral Properties, net book value	359,286	361,557
Aggregates Properties [Member]
Mineral Properties, carrying value	8,655	8,655
Mineral Properties, accumulated depletion	(4,139)	(4,065)
Mineral Properties, net book value	4,516	4,590
Oil and Gas Royalty Properties [Member]
Mineral Properties, carrying value	12,354	12,354
Mineral Properties, accumulated depletion	(10,441)	(10,394)
Mineral Properties, net book value	1,913	1,960
Other [Member]
Mineral Properties, carrying value	13,142	13,143
Mineral Properties, accumulated depletion	(1,612)	(1,612)
Mineral Properties, net book value	$ 11,530	$ 11,531

X

- Definition

The accumulated decrease in the carrying value of the mineral properties as a result of mine or mineral production.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying amount at the balance sheet date of mineral properties, gross of adjustments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 360
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Mineral properties, net of adjustments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 360
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

+ Details

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X

- Details

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Period Type:

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- Details

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Balance Type:
Period Type:

X

- Details

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Balance Type:
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- Details

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