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Note 4 - Inventory	6 Months Ended
	Jun. 30, 2024
Notes to Financial Statements
Inventory Disclosure [Text Block]	(4) INVENTORY Inventory is valued at a lower of cost or net realizable value (NRV).  As of June 30, 2024, and December 31, 2023, coal inventory includes NRV adjustments of $0.9 million and $2.0 million, respectively.

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- References

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- Definition

The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 330
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/330/tableOfContent

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