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Note 16 - Tax Expense (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019 | [1]
Statement Line Items [Line Items] |  |  |  |  |  |
Applicable tax rate |  | 0.00% | 0.00% |  | 0.00% |
Total average effective tax rate |  | 37.52% |  |  |  |
Net deferred tax assets |  | $ 87 | $ 63 | [1] |  | $ 98
Net deferred tax liabilities |  | 4,234 | 3,129 | [1] |  | $ 23,328
South African operations [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Net deferred tax assets |  | 87 | 63 |  | $ 98 |
Zimbabwean operations [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Net deferred tax liabilities |  | $ 4,234 | $ 3,129 |  | $ 23,328 |
Zimbabwean operations [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Tax rate effect of foreign tax rates |  | 25.75% |  |  |  |
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 | 24.72% |  |  |  |  |
South African operations [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Tax rate effect of foreign tax rates |  | 28.00% |  |  |  |
[1] | The Group voluntarily changed its disclosure policy for exploration and evaluation assets to be disclosed separately as Exploration and evaluation assets rather than as part of Property, plant and equipment; similarly lease liabilities were classified separately from trade and other payables (refer to note 4(b)(i) and 4(b)(ii)). The new disclosure policies were adopted from December, 2020 and have been applied retrospectively.

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