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Note 14 - Tax Expense (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement Line Items [Line Items] |  |  |
Applicable tax rate | 0.00% | 0.00% | 26.50%
Tax rate effect of expense not deductible in determining taxable profit (tax loss) | 15.00% |  |
Net deferred tax assets | $ 65 | $ 44 |
Net deferred tax liabilities | 19,620 | 15,909 |
South African operations [member] |  |  |
Statement Line Items [Line Items] |  |  |
Net deferred tax assets | 65 | 44 |
Zimbabwean operations [member] |  |  |
Statement Line Items [Line Items] |  |  |
Net deferred tax liabilities | $ 19,620 | $ 15,909 |

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2017-03-09 + Details
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