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Note 17 - Tax Expense (Details Textual) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 01, 2017 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement Line Items [Line Items] |  |  |  |  |  |
Applicable tax rate |  |  | 0.00% | 0.00% |  | 0.00%
Tax rate effect of expense nondeductible witholding tax current year |  | 5.00% |  |  |  | 15.00%
Net deferred tax assets |  |  | $ 63 | $ 98 | [1] |
Net deferred tax liabilities |  |  | 3,129 | 23,328 | [1] |
South African operations [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Net deferred tax assets |  |  | 63 | 98 |  |
Zimbabwean operations [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Net deferred tax liabilities |  |  | $ 3,129 | 23,328 |  |
Zimbabwe Area [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Tax rate effect of foreign tax rates |  |  | 25.75% |  |  |
Management fee withholding tax |  |  |  |  |  | 15.00%
Amount offset against outstanding income tax liabilities | $ 395 |  |  |  |  |
SOUTH AFRICA |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Tax rate effect of foreign tax rates |  |  | 28.00% |  |  |
Increase to income tax liability relating to Voluntary Disclosure Permission agreement |  |  |  | $ 269 |  |
SOUTH AFRICA | Bottom of range [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Tax rate effect of foreign tax rates |  |  |  | 15.00% |  |
SOUTH AFRICA | Top of range [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Tax rate effect of foreign tax rates |  |  |  | 5.00% |  |
Eersteling Gold Mining Company Limited [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Unrecognised tax losses |  |  | $ 5 |  |  |
[1] | The Group initially applied IFRS 16 on January 1, 2019, using the modified retrospective approach. Under this approach, comparative information is not restated. There was no cumulative effect of initially applying IFRS 16 to recognise in retained earnings at the date of initial application.

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