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Note 16 - Tax Expense - Movement in Recognized Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Statement Line Items [Line Items] |  |  |  |
Deferred tax assets (liabilities) |  | $ (19,555) | [1] | $ (15,865)
Recognised in profit or loss |  | (3,662) |  | (3,696)
Foreign exchange movement |  | (13) |  | 6
Deferred tax assets (liabilities) | [1] | (23,230) |  | (19,555)
Property, plant, and equipment deferred tax liability [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax assets (liabilities) |  | (20,985) | [1] | (17,092)
Recognised in profit or loss |  | (3,945) |  | (3,893)
Foreign exchange movement |  |  |  |
Deferred tax assets (liabilities) | [1] | (24,930) |  | (20,985)
Allowance for obsolete stock deferred tax asset [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax assets (liabilities) |  | 35 | [1] | 12
Recognised in profit or loss |  | 223 |  | 23
Foreign exchange movement |  |  |  |
Deferred tax assets (liabilities) | [1] | 258 |  | 35
Prepayments deferred tax liability [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax assets (liabilities) |  | (4) | [1] | (3)
Recognised in profit or loss |  |  |  | (1)
Foreign exchange movement |  | 1 |  |
Deferred tax assets (liabilities) | [1] | (3) |  | (4)
Unrealised foreign exchange gains (losses) [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax assets (liabilities) |  | 97 | [1] |
Recognised in profit or loss |  | (63) |  | 97
Foreign exchange movement |  |  |  |
Deferred tax assets (liabilities) | [1] | 34 |  | 97
Share-based payments deferred tax assets [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax assets (liabilities) |  | 12 | [1] |
Recognised in profit or loss |  | 3 |  | 12
Foreign exchange movement |  | (2) |  |
Deferred tax assets (liabilities) | [1] | 13 |  | 12
Provisions [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax assets (liabilities) |  | 1,290 | [1] | 1,218
Recognised in profit or loss |  | 104 |  | 66
Foreign exchange movement |  | (8) |  | 6
Deferred tax assets (liabilities) | [1] | 1,386 |  | 1,290
Other temporary differences [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred tax assets (liabilities) |  |  |  |
Recognised in profit or loss |  | 16 |  |
Foreign exchange movement |  | (4) |  |
Deferred tax assets (liabilities) |  | $ 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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