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Note 2 - Revenue From Contracts With Customers - Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Accounts payable	$ 1,455		$ 909
Current portion of deferred revenue	4,949		4,341
Deferred revenue	51,979		55,814
Balance	60,155	$ 42,955
Increase due to minimums and lease amendment fees	5,861	6,979
Recognition of previously deferred revenue	(9,088)	(5,951)
Balance	56,928	$ 43,983
Coal Royalty Revenues [Member]
Accounts payable	175		125
Current portion of deferred revenue	4,949		4,341
Deferred revenue	51,979		55,814
Coal Royalty Revenues [Member] | Accounts Receivable [Member]
Contract with customer, current	27,235		27,358
Coal Royalty Revenues [Member] | Other Current Assets [Member]
Contract with customer, current	815		0
Coal Royalty Revenues [Member] | Other Long Term Assets [Member]
Contract with customer, noncurrent	$ 1,139		$ 2,352

X

- Definition

The amount of deferred revenue contractual minimum payments during the reporting period.

+ References

No definition available.

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- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional, classified as noncurrent.

+ References

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X

- Definition

Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as current.

+ References

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Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as noncurrent.

+ References

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- Definition

Amount of revenue recognized that was previously reported as deferred or unearned revenue.

+ References

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