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Note 16 - Tax Expense (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement Line Items [Line Items] |  |  |  |
Applicable tax rate |  | 0.00% | 0.00% | 0.00%
Tax rate effect of expense not deductible in determining taxable profit (tax loss) |  | 15.00% | 15.00% |
Net deferred tax assets |  | $ 98 | $ 65 |
Net deferred tax liabilities |  | 23,328 | 19,620 |
South African operations [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net deferred tax assets |  | 98 | 65 |
Zimbabwean operations [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net deferred tax liabilities |  | $ 23,328 | $ 19,620 |
Zimbabwe Area [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Tax rate effect of foreign tax rates |  | 25.75% |  |
Management fee withholding tax |  | 5.00% | 15.00% | 15.00%
Amount offset against outstanding income tax liabilities | $ 395 |  |  |
Non-deductible withholding tax |  |  | $ 269 |
SOUTH AFRICA |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Tax rate effect of foreign tax rates |  | 28.00% |  |
Increase to income tax liability relating to Voluntary Disclosure Permission agreement |  | $ 220 |  |

X
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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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- Definition The amount of deferred tax assets net of deferred tax liabilities, when the absolute amount of deferred tax assets is greater than the absolute amount of deferred tax liabilities. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of deferred tax liabilities net of deferred tax assets, when the absolute amount of deferred tax liabilities is greater than the absolute amount of deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from the expenses not deductible in determining taxable profit. [Refer: Average effective tax rate; Applicable 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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- Definition The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from the application of foreign tax rates. [Refer: Average effective tax rate; Applicable 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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