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Note 16 - Tax Expense - Recognised Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Statement Line Items [Line Items] |  |  |  |
Deferred tax asset |  | $ 1,409 | $ 1,545 |
Deferred tax liability |  | (6,330) | (9,385) |
Net deferred tax asset (liability) |  | (4,921) | (7,840) | $ (4,147)
Net tax assets (liabilities) [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net deferred tax asset (liability) | [1] | (4,921) | (7,840) |
Property, plant, and equipment deferred tax liability [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax asset |  | 0 | 0 |
Deferred tax liability |  | (6,323) | (9,328) |
Net deferred tax asset (liability) |  | (6,323) | (9,328) | (5,380)
Property, plant, and equipment deferred tax liability [member] | Net tax assets (liabilities) [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net deferred tax asset (liability) |  | (6,323) | (9,328) |
Evaluation and exploration assets [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax asset |  | 0 | 0 |
Deferred tax liability |  | (2) | 0 |
Net deferred tax asset (liability) |  | (2) | (47) | (29)
Evaluation and exploration assets [member] | Net tax assets (liabilities) [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net deferred tax asset (liability) |  | (2) | 0 |
Allowance for obsolete stock deferred tax asset [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax liability |  | 0 | (47) |
Net deferred tax asset (liability) |  | (163) | 3 | 13
Allowance for obsolete stock |  | (163) | 0 |
Allowance for obsolete stock deferred tax asset [member] | Net tax assets (liabilities) [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net deferred tax asset (liability) |  | (163) | (47) |
Prepayments deferred tax liability [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax asset |  | 0 | 3 |
Deferred tax liability |  | (5) | 0 |
Net deferred tax asset (liability) |  | (5) | (10) | (3)
Prepayments deferred tax liability [member] | Net tax assets (liabilities) [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net deferred tax asset (liability) |  | (5) | 3 |
Unrealised foreign exchange gains (losses) [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax asset |  | 733 | 0 |
Deferred tax liability |  | 0 | (10) |
Net deferred tax asset (liability) |  | 733 | 499 | 530
Unrealised foreign exchange gains (losses) [member] | Net tax assets (liabilities) [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net deferred tax asset (liability) |  | 733 | (10) |
Trade and Other Payables 1 [Member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax asset |  | 814 | 499 |
Deferred tax liability |  | 0 | 0 |
Trade and Other Payables 1 [Member] | Net tax assets (liabilities) [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net deferred tax asset (liability) |  | 814 | 499 |
Cash-settled awards [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax asset |  | 0 | 989 |
Deferred tax liability |  | 0 | 0 |
Net deferred tax asset (liability) |  |  | 0 | 8
Cash-settled awards [member] | Net tax assets (liabilities) [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net deferred tax asset (liability) |  | 0 | 989 |
Provisions [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax asset |  | 25 | 0 |
Deferred tax liability |  | 0 | 0 |
Net deferred tax asset (liability) |  | 25 | 54 | $ 60
Provisions [member] | Net tax assets (liabilities) [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net deferred tax asset (liability) |  | 25 | 0 |
Other Temporary Differences 1 [Member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax asset |  | 0 | 54 |
Deferred tax liability |  | 0 | 0 |
Other Temporary Differences 1 [Member] | Net tax assets (liabilities) [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net deferred tax asset (liability) |  | $ 0 | $ 54 |
[1] | The net deferred tax liability consists of a deferred tax asset of $202 (2021: $194) from the South African operation and a net deferred tax liability of $5,123 (2021: $8,034) due to the Blanket Mine 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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