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Note 17 - Tax Expense - Recognised Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax liability | $ (4,199) |  | $ (24,933) |  |
Net deferred tax asset (liability) | (3,066) | [1] | (23,230) | [1] | $ (19,555)
Deferred tax asset | 1,133 |  | 1,703 |  |
Property, plant, and equipment deferred tax liability [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax liability | (4,195) |  | (24,930) |  |
Net deferred tax asset (liability) | (4,195) | [1] | (24,930) | [1] | (20,985)
Allowance for obsolete stock deferred tax asset [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Net deferred tax asset (liability) | 22 | [1] | 258 | [1] | 35
Deferred tax asset | 22 |  | 258 |  |
Prepayments deferred tax liability [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax liability | (4) |  | (3) |  |
Net deferred tax asset (liability) | (4) | [1] | (3) | [1] | (4)
Unrealised foreign exchange gains (losses) [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Net deferred tax asset (liability) | 309 | [1] | 34 | [1] | 97
Deferred tax asset | 309 |  | 34 |  |
Trade and other payables [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Net deferred tax asset (liability) | 739 | [1] | 486 |  | 429
Deferred tax asset | 739 |  |  |  |
Share-based payments deferred tax assets [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Net deferred tax asset (liability) | 5 | [1] | 13 | [1] | 12
Deferred tax asset | 5 |  | 13 |  |
Provisions [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Net deferred tax asset (liability) | 58 | [1] | 852 |  | 813
Deferred tax asset | 58 |  | 1,386 |  |
Other temporary differences [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Net deferred tax asset (liability) |  |  | 12 |  | $ 48
Deferred tax asset |  |  | $ 12 |  |
[1] | The deferred tax liability consists of a deferred tax asset of $63 (2018: $98) from the South African operation and a net deferred tax liability of $3,129 (2018: $23,328) 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 a 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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