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Note 16 - Tax Expense (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Statement Line Items [Line Items] |  |  |  |
Applicable tax rate |  | 0.00% | 0.00% | 0.00%
Total average effective tax rate |  | 35.36% | 39.10% |
Net deferred tax assets |  | $ 202 | $ 194 |
Net deferred tax liabilities |  | 5,123 | 8,034 |
South African operations [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net deferred tax assets |  | 202 | 194 |
Zimbabwean operations [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net deferred tax liabilities |  | $ 5,123 | $ 8,034 |
Zimbabwean operations [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Tax rate effect of foreign tax rates |  | 24.72% | 24.72% | 25.75%
South African operations [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Tax rate effect of foreign tax rates |  | 28.00% | 28.00% | 28.00%
South African operations [member] | Changes in tax rates or tax laws enacted or announced [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Tax rate effect of foreign tax rates | 27.00% |  |  |

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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 2021-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2021-03-24 + Details
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