Amount of contingent liability relating to take or pay arrangements.

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The amount of gain that could be realized upon the resolution of a contingency.

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No definition available.

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The number of raw coal storage silos.

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The number of raw coal storage silos that experienced partial structure failure.

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The percent of plant capacity restored after partial structural failure.

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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Amount awarded from other party in judgment or settlement of litigation.

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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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No definition available.

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Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Amount of damages awarded to the plaintiff in the legal matter.

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Amount of a reclamation and mine closing liability that is associated with a legal obligation for the closure and reclamation of a mine including the removal of buildings, equipment, machinery and other physical remnants of mining, closure of tailings impoundments, leach pads and other mine features, and contouring, covering and revegetation of waste rock piles and other disturbed areas.

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Amount of cash inflow for proceeds from settlement of insurance claim, classified as investing activities. Excludes insurance settlement classified as operating activities.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

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Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property.

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Note 10 - Commitments and Contingencies (Details) $ in Thousands						12 Months Ended
	Jul. 20, 2023 USD ($)	Mar. 04, 2022 USD ($)	Jul. 16, 2021 USD ($)	Jul. 15, 2021 USD ($)	Nov. 05, 2018 item	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
COMMITMENTS AND CONTINGENCIES
Reclamation bonding requirements						$ 27,200
Asset Retirement Obligation						28,960	$ 28,885	$ 22,549
Royalty Expense						35,000	$ 34,200	$ 18,500
Compensatory damages	$ 7,700	$ 1,800	$ 25,000	$ 7,700
Award to cover inconvenience and aggravation	$ 25,000
Proceeds from insurance for methane ignition on mine						9,200
Number of raw coal storage silos, failure \| item					1
Number of raw coal storage silos \| item					3
Percentage of structural failure					80.00%
Gain recorded from contingency						7,800
Insurance proceeds related to property, plant, and equipment						11,256
Take-or-pay Purchase Commitments
COMMITMENTS AND CONTINGENCIES
Amount of contingent liability						800
Commitment						20,000
Total commitment						$ 20,200
Commitment term						5 years
Environmental Restoration Costs [Member]
COMMITMENTS AND CONTINGENCIES
Regulatory Liabilities						$ 0
Environmental
COMMITMENTS AND CONTINGENCIES
Regulatory Liabilities						0
Mining property and mineral rights
COMMITMENTS AND CONTINGENCIES
Insurance proceeds related to property, plant, and equipment						$ 2,000