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Note 17 - Tax Expense - Recognised Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax asset | $ 1,545 |  | $ 1,265 |  |
Deferred tax liability | (9,385) |  | (5,412) |  |
Net deferred tax asset (liability) | (7,840) | [1] | (4,147) | [1] | $ (3,066)
Property, plant, and equipment deferred tax liability [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax asset | 0 |  | 0 |  |
Deferred tax liability | (9,328) |  | (5,380) |  |
Net deferred tax asset (liability) | (9,328) |  | (5,380) |  | (4,117)
Evaluation and exploration assets [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax asset | 0 |  | 0 |  |
Deferred tax liability | (47) |  | (29) |  |
Net deferred tax asset (liability) | (47) |  | (29) |  | (78)
Allowance for obsolete stock deferred tax asset [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax asset | 3 |  | 13 |  |
Deferred tax liability | 0 |  | 0 |  |
Net deferred tax asset (liability) | 3 |  | 13 |  | 22
Prepayments deferred tax liability [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax asset | 0 |  | 0 |  |
Deferred tax liability | (10) |  | (3) |  |
Net deferred tax asset (liability) | (10) |  | (3) |  | (4)
Unrealised foreign exchange gains (losses) [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax asset | 499 |  | 530 |  |
Deferred tax liability | 0 |  | 0 |  |
Net deferred tax asset (liability) | 499 |  | 530 |  | 309
Trade and Other Payables 1 [Member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax asset | 989 |  | 636 |  |
Deferred tax liability | 0 |  | 0 |  |
Net deferred tax asset (liability) | 989 |  | 636 |  |
Cash-settled awards [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax asset | 0 |  | 8 |  |
Deferred tax liability | 0 |  | 0 |  |
Net deferred tax asset (liability) | 0 |  | 8 |  | 5
Provisions [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax asset | 54 |  | 60 |  |
Deferred tax liability | 0 |  | 0 |  |
Net deferred tax asset (liability) | 54 |  | 60 |  | $ 58
Other Temporary Differences 1 [Member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax asset | 0 |  | 18 |  |
Deferred tax liability | 0 |  | 0 |  |
Net deferred tax asset (liability) | $ 0 |  | $ 18 |  |
[1] | The net deferred tax liability consists of a deferred tax asset of $194 (2020: $87, January 1, 2020: $63) from the South African operation and a net deferred tax liability of $8,034 (2020: $4,234, January 1, 2020: $3,129) due to the Zimbabwean operation. The amounts are in different tax jurisdictions and cannot be offset. The amounts are presented as part of Non-current assets and Non-current liabilities in the Statements of financial position. The deferred tax asset recognised is supported by evidence of probable future taxable income.

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