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Note 5 - Environmental and Reclamation Activities - Additional Information (Details) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | $ 120,457 | $ 116,999 | $ 113,231 | $ 116,048
Minimum [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Inflation Rate, Asset Retirement Obligation | 2.00% |  |  |
Minimum [Member] | Reclamation and Abandonment Costs [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Derivative liability, measurement input | 0.0575 |  |  |
Minimum [Member] | Asset Retirement Obligation [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Derivative liability, measurement input | 0.0275 |  |  |
Maximum [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Inflation Rate, Asset Retirement Obligation | 4.00% |  |  |
Maximum [Member] | Reclamation and Abandonment Costs [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Derivative liability, measurement input | 0.145 |  |  |
Maximum [Member] | Asset Retirement Obligation [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Derivative liability, measurement input | 0.075 |  |  |

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