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Note 7 - Commitments and Contingencies (Details) - USD ($) $ in Millions |  |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 20, 2023 | Mar. 04, 2022 | Jul. 16, 2021 | Jul. 15, 2021 | Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
COMMITMENTS AND CONTINGENCIES |  |  |  |  |  |  |
Royalty expense |  |  |  |  | $ 6.8 | $ 9.0 |
Compensatory damages | $ 7.7 | $ 1.8 | $ 25.0 | $ 7.7 |  |  |
Award to cover inconvenience and aggravation | $ 25.0 |  |  |  |  |  |
Accrued amount |  |  |  |  | 1.4 |  | $ 0.8
Surety Bond |  |  |  |  |  |  |
COMMITMENTS AND CONTINGENCIES |  |  |  |  |  |  |
Asset Retirement Obligation |  |  |  |  | 30.2 |  |
Take-or-pay Purchase Commitments |  |  |  |  |  |  |
COMMITMENTS AND CONTINGENCIES |  |  |  |  |  |  |
Commitment |  |  |  |  | 19.4 |  |
Total commitment |  |  |  |  | $ 30.7 |  |
Commitment term |  |  |  |  | 4 years |  |
Environmental |  |  |  |  |  |  |
COMMITMENTS AND CONTINGENCIES |  |  |  |  |  |  |
Environmental liabilities |  |  |  |  | $ 0.0 |  |

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