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Note 14 - Tax Expense - Recognised Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Statement Line Items [Line Items] |  |  |  |  |  |
Deferred tax asset |  | $ 1,434 |  | $ 1,230 |  |
Deferred tax liability |  | (20,989) |  | (17,095) |  |
Net deferred tax asset (liability) |  | (19,555) | [1] | (15,865) | [1] | $ (11,260)
Property, plant, and equipment deferred tax liability [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Deferred tax asset |  |  |  |  |  |
Deferred tax liability |  | (20,985) |  | (17,092) |  |
Net deferred tax asset (liability) |  | (20,985) | [1] | (17,092) | [1] | (12,988)
Allowance for obsolete stock deferred tax asset [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Deferred tax asset |  | 35 |  | 12 |  |
Deferred tax liability |  |  |  |  |  |
Net deferred tax asset (liability) |  | 35 | [1] | 12 | [1] |
Prepayments deferred tax liability [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Deferred tax asset |  |  |  |  |  |
Deferred tax liability |  | (4) |  | (3) |  |
Net deferred tax asset (liability) |  | (4) | [1] | (3) | [1] | (3)
Unrealised foreign exchange gains (losses) [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Deferred tax asset |  | 97 |  |  |  |
Deferred tax liability |  |  |  |  |  |
Net deferred tax asset (liability) | [1] | 97 |  |  |  |
Share-based payments deferred tax assets [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Deferred tax asset |  | 12 |  |  |  |
Deferred tax liability |  |  |  |  |  |
Net deferred tax asset (liability) | [1] | 12 |  |  |  |
Other temporary differences [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Deferred tax asset |  | 1,290 |  | 1,218 |  |
Deferred tax liability |  |  |  |  |  |
Net deferred tax asset (liability) |  | $ 1,290 | [1] | $ 1,218 | [1] | $ 733
[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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