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Note 11 - Self-Insurance (Details Textual) $ in Thousands | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2023 USD ($)
--- | --- | --- | ---
Operating Lease, Liability | $ 638 | $ 712 |
Restricted Cash and Cash Equivalents | 4,282 | 4,281 | $ 4,033
Future Workers' Compensation Claim Payments [Member] |  |  |
Restricted Cash and Cash Equivalents | $ 4,300 | $ 4,300 |
Mining Properties and Mineral Rights [Member] |  |  |
Number of Mining Units | 4 | 7 |
Geographic Spread of Mining Units, in Miles | 7 | 11 |
Operating Lease, Liability | $ 250,400 | $ 262,000 |

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