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Note 5 - Tribute Arrangement and Mining Agreement and Bilboes Gold Limited Acquisition (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 2 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 06, 2023 | Jul. 21, 2022 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Apr. 11, 2023 | Mar. 30, 2023
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Administrative expenses |  |  |  | $ 17,429 | $ 11,941 | $ 9,091 |  |
Assets of Bilboes Gold Limited [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Acquisition, number of shares issuable (in shares) |  | 5,123,044 |  |  |  |  |  |
Percentage of net smelter royalty |  | 1.00% |  |  |  |  |  |
Acquisition, number of shares issued (in shares) | 4,425,797 |  |  |  |  |  |  |
Acquisition, escrow shares issuable (in shares) | 441,095 |  |  |  |  |  |  | 441,095
Acquisition, deferred consideration shares issuable (in shares) | 256,152 |  |  |  |  |  | 256,152 |
Acquistion, consideration shares issued (in shares) |  |  |  |  |  |  | 5,123,044 |
Acquisition, consideration issued and issuable | $ 65,677 |  |  |  |  |  | $ 65,677 |
Acquisition, consideration shares, closing share price (in dollars per share) |  |  |  |  |  |  | $ 12.82 |
Administrative expenses |  |  |  | $ 3,100 |  |  |  |
Caledonia Holdings Zimbabwe (Private) Limited [member] | Bilboes Holdings (Private) Limited [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Tribute agreement, rate of return |  | 25.00% |  |  |  |  |  |
Caledonia Holdings Zimbabwe (Private) Limited [member] | Bilboes Holdings (Private) Limited [member] | Oxide plant [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, expenditures recognised in course of its construction |  | $ 872 |  |  |  |  |  |
Impairment of property, plant and equipment |  |  | $ 851 |  |  |  |  |

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