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Note 3 - Liquidity (Details Textual) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 18, 2025 | Jan. 31, 2025 | Sep. 30, 2024 | Jul. 31, 2024 | Mar. 31, 2027 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023
Schedule Of Liquidity [Line Items] |  |  |  |  |  |  |  |  |  |
Principal payments |  |  |  |  |  |  | $ 0 | $ 7,900,000 | $ 0 | $ 0
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Liquidity [Line Items] |  |  |  |  |  |  |  |  |  |
Principal payments | $ 10,600,000 | $ 13,800,000 |  |  |  |  |  |  |  |
Outstanding Principal Balance |  | 38,300,000 |  |  |  |  |  |  |  |
The Joint Venture Company [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Liquidity [Line Items] |  |  |  |  |  |  |  |  |  |
Exploration Budget, Funded Amount |  |  |  |  |  | $ 78,600,000 |  | 78,600,000 |  |
Exploration budget funded amount for next fiscal year |  |  |  |  |  | 0 |  | 0 |  |
Exploration budget amount funded by the company for next fiscal year |  |  |  |  |  | 31,300,000 |  | 31,300,000 |  |
Distributions from exploration |  |  | $ 19,500,000 |  |  |  |  |  |  |
Cash distribution relating to production |  |  |  |  |  | 21,000,000 |  |  |  |
Cash distributions received |  |  |  | $ 40,500,000 |  |  |  |  |  |
Repayment obligations on the facility |  |  |  |  |  |  |  | 42,600,000 |  |
Principal payments |  |  |  |  |  |  |  | 7,900,000 |  |
The Joint Venture Company [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Liquidity [Line Items] |  |  |  |  |  |  |  |  |  |
Principal payments |  | 13,800,000 |  |  |  |  |  |  |  |
Outstanding Principal Balance |  | $ 38,300,000 |  |  |  |  |  |  |  |
Scenario Forecast [Member] | The Joint Venture Company [Member] | Amended Facility [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Liquidity [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred principal repayments |  |  |  |  | $ 10,600,000 |  |  |  |  |
Maturity date, description |  |  |  |  | extend the maturity date of the Facility from December 31, 2026 to June 30, 2027 |  |  |  |  |
Capital Calls [Member] | The Joint Venture Company [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Liquidity [Line Items] |  |  |  |  |  |  |  |  |  |
Exploration Budget, Funded Amount |  |  |  |  |  | $ 31,300,000 |  | $ 31,300,000 |  |

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