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Note 5 - Critical Accounting Estimates and Judgments - Schedule of Key Assumptions for Reclamation Obligations (Details) - Provision for decommissioning, restoration and rehabilitation costs [member] | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Risk-free interest rate, measurement input [member] |  |  |
Statement Line Items [Line Items] |  |  |
Key assumptions |  | 0.0302 | 0.0328
Risk-free interest rate, measurement input [member] | Bottom of range [member] |  |  |
Statement Line Items [Line Items] |  |  |
Key assumptions | 0.0323 |  |
Risk-free interest rate, measurement input [member] | Top of range [member] |  |  |
Statement Line Items [Line Items] |  |  |
Key assumptions | 0.0333 |  |
Annual inflation rate, measurement input [member] |  |  |
Statement Line Items [Line Items] |  |  |
Key assumptions |  | 0.0225 | 0.025
Annual inflation rate, measurement input [member] | Bottom of range [member] |  |  |
Statement Line Items [Line Items] |  |  |
Key assumptions | 0.0229 | 0.0225 |
Annual inflation rate, measurement input [member] | Top of range [member] |  |  |
Statement Line Items [Line Items] |  |  |
Key assumptions | 0.0283 | 0.0261 |

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