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Note 14 - Tax Expense - Movement in Recognized Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Statement Line Items [Line Items] |  |  |  |
Deferred tax assets (liabilities) |  | $ (15,865) | [1] | $ (11,260)
Recognised in profit or loss |  | (3,696) |  | (4,611)
Foreign exchange movement |  | 6 |  | 6
Deferred tax assets (liabilities) | [1] | (19,555) |  | (15,865)
Property, plant, and equipment deferred tax liability [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax assets (liabilities) |  | (17,092) | [1] | (12,988)
Recognised in profit or loss |  | (3,893) |  | (4,104)
Foreign exchange movement |  |  |  |
Deferred tax assets (liabilities) | [1] | (20,985) |  | (17,092)
Allowance for obsolete stock deferred tax asset [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax assets (liabilities) |  | 12 | [1] |
Recognised in profit or loss |  | 23 |  | 12
Foreign exchange movement |  |  |  |
Deferred tax assets (liabilities) | [1] | 35 |  | 12
Prepayments deferred tax liability [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax assets (liabilities) |  | (3) | [1] | (3)
Recognised in profit or loss |  | (1) |  | 2
Foreign exchange movement |  |  |  | (2)
Deferred tax assets (liabilities) | [1] | (4) |  | (3)
Unrealised foreign exchange gains (losses) [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax assets (liabilities) | [1] |  |  |
Recognised in profit or loss |  | 97 |  |
Foreign exchange movement |  |  |  |
Deferred tax assets (liabilities) | [1] | 97 |  |
Other temporary differences [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax assets (liabilities) |  | 1,218 | [1] | 733
Recognised in profit or loss |  | 66 |  | 477
Foreign exchange movement |  | 6 |  | 8
Deferred tax assets (liabilities) | [1] | 1,290 |  | 1,218
Share-based payments deferred tax assets [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax assets (liabilities) | [1] |  |  |
Recognised in profit or loss |  | 12 |  |
Foreign exchange movement |  |  |  |
Deferred tax assets (liabilities) | [1] | 12 |  |
Assessed tax losses deferred tax asset [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax assets (liabilities) |  |  |  | 998
Recognised in profit or loss |  |  |  | (998)
Foreign exchange movement |  |  |  |
Deferred tax assets (liabilities) |  |  |  |
[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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