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Note 16 - Tax Expense - Recognised Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax asset | $ 1,703 |  | $ 1,434 |  |
Deferred tax liability | (24,933) |  | (20,989) |  |
Net deferred tax asset (liability) | (23,230) | [1] | (19,555) | [1] | $ (15,865)
Property, plant, and equipment deferred tax liability [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax asset |  |  |  |  |
Deferred tax liability | (24,930) |  | (20,985) |  |
Net deferred tax asset (liability) | (24,930) | [1] | (20,985) | [1] | (17,092)
Allowance for obsolete stock deferred tax asset [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax asset | 258 |  | 35 |  |
Deferred tax liability |  |  |  |  |
Net deferred tax asset (liability) | 258 | [1] | 35 | [1] | 12
Prepayments deferred tax liability [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax asset |  |  |  |  |
Deferred tax liability | (3) |  | (4) |  |
Net deferred tax asset (liability) | (3) | [1] | (4) | [1] | (3)
Unrealised foreign exchange gains (losses) [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax asset | 34 |  | 97 |  |
Deferred tax liability |  |  |  |  |
Net deferred tax asset (liability) | 34 | [1] | 97 | [1] |
Share-based payments deferred tax assets [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax asset | 13 |  | 12 |  |
Deferred tax liability |  |  |  |  |
Net deferred tax asset (liability) | 13 | [1] | 12 | [1] |
Provisions [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax asset | 1,386 |  | 1,290 |  |
Deferred tax liability |  |  |  |  |
Net deferred tax asset (liability) | 1,386 | [1] | 1,290 | [1] | $ 1,218
Other temporary differences [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Deferred tax asset | 12 |  |  |  |
Deferred tax liability |  |  |  |  |
Net deferred tax asset (liability) | $ 12 |  |  |  |
[1] | The deferred tax liability consists of a deferred tax asset of $65 (2016: $44) from the South African operations and a deferred tax liability of $19,620 (2016: $15,909) due to the Zimbabwean operations. The amounts are in different tax jurisdictions and cannot offset. The amounts are presented as a Non-current asset and a Non-current liability in the Statement of financial position. The deferred tax asset recognised is supported by evidence of probable future taxable income.

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