INVENTORIES (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
INVENTORIES
Coal	$ 37,290	$ 56,549
Finished goods (net of reserve for obsolescence)	14,197	11,752
Work in process	1,560	2,379
Raw materials	7,192	6,448
Total operating inventories, net	60,239	77,128
Supplies (net of reserve for obsolescence)	60,422	50,428
Total inventories, net	120,661	127,556
Reduce inventory carrying value to market	24,568	33,296	$ 364
Manufactured goods
INVENTORIES
Reserve for obsolescence	2,481	2,188
Supplies
INVENTORIES
Reserve for obsolescence	$ 6,409	$ 5,979

Carrying amount as of the balance sheet date of energy and manufactured goods inventory, net of reserves.

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- Definition

Carrying amount as of the balance sheet date of coal, which is a combustible rock or minerals which are extracted from the ground and used as fuel.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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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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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

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Amount of valuation reserve for inventory.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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