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Note 16 - Tax Expense (Details Textual) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 01, 2024 | Nov. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Statement Line Items [Line Items] |  |  |  |  |  |  |
Applicable tax rate |  |  |  |  | 25.75% |  |
Total average effective tax rate |  |  |  |  | 105.07% | 42.31% |
Net deferred tax assets |  |  |  | $ 153 | $ 153 | $ 202 |
Net deferred tax liabilities |  |  |  | 6,131 | 6,131 | 5,123 |
South African operations [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Net deferred tax assets |  |  |  | 153 | 153 | 202 |
Zimbabwean operations [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Net deferred tax liabilities |  |  |  | $ 6,131 | $ 6,131 | $ 5,123 |
Jersey, Channel Islands [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Applicable tax rate |  |  |  |  | 0.00% | 0.00% | 0.00%
Zimbabwean operations [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Tax rate effect of foreign tax rates |  | 24.72% |  |  | 24.72% | 24.72% |
Zimbabwean operations [member] | Changes in tax rates or tax laws enacted or announced [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Tax rate effect of foreign tax rates | 25.75% |  |  |  |  |  |
South African operations [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Tax rate effect of foreign tax rates |  |  | 28.00% | 27.00% | 27.00% | 28.00% |
Bilboes [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Tax effect of acquisition |  |  |  |  | $ 3,763 |  |

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