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Note 11 - Self-Insurance	6 Months Ended
	Jun. 30, 2024
Notes to Financial Statements
Self Insurance [Text Block]	(11) SELF-INSURANCE We self-insure our non-leased underground mining equipment. Such equipment was allocated among four mining units dispersed over seven miles and seven mining units dispersed over eleven miles, at June 30, 2024 and December 31, 2023, respectively. The historical cost of such equipment was approximately $250.4 million and $262.0 million as of June 30, 2024, and December 31, 2023. We also self-insure for workers’ compensation claims.  Restricted cash of $4.3 million as of June 30, 2024, and December 31, 2023, represents cash held and controlled by a third party and is restricted primarily for future workers’ compensation claim payments.

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