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Note 5 - Blanket Zimbabwe Indigenisation Transaction (Details Textual) - USD ($) $ in Thousands |  |  | 2 Months Ended | 5 Months Ended | 7 Months Ended | 12 Months Ended | 19 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 23, 2017 | Feb. 20, 2012 | Apr. 30, 2013 | Feb. 28, 2013 | Sep. 30, 2012 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jul. 31, 2016 | Jun. 22, 2017 | Oct. 19, 2016
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  | 51.00% |  |  |  | 51.00% |  |  |  |  |
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity attributable to owners of parent |  | $ 30,090 |  |  |  |  |  |  |  |  |
Non-controlling interest, non-refundable donation |  | $ 1,000 |  |  |  |  |  |  |  |  |
Dividend loans, Percentage of dividend as payment of interest | 80.00% | 80.00% |  |  |  |  |  |  |  |  |
Proportion of dividends declared accruing unconditionally |  | 20.00% |  |  |  |  |  |  |  |  |
Percentage of net assets recognised as NCI |  | 16.20% |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  |  |  |  | 10.00% |
Borrowings, interest rate | 7.25% |  |  |  |  |  |  |  |  |  | 7.25%
Expense from equity-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets | $ 806 |  |  |  |  | $ 835 | $ 170 | $ 24 |  |  |
Dividends received |  |  |  |  |  |  |  |  | $ 0 |  |
Cash advances on dividend loans |  |  | $ 1,000 | $ 1,000 | $ 2,000 |  |  |  |  |  |
NIEEF [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  | 16.00% |  |  |  | 16.00% |  |  |  |  |
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity attributable to owners of parent |  | $ 11,740 |  |  |  |  |  |  |  |  |
Proportion of ownership interest sold |  | 16.00% |  |  |  |  |  |  |  |  |
Non-controlling interests recognised, dividends declared accruing unconditionally |  | 20.00% |  |  |  |  |  |  |  |  |
Non-controlling interests recognised, portion recognised to the extent net asset value exceeds faciliation loans |  | 80.00% |  |  |  |  |  |  |  |  |
Fremiro [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  | 15.00% |  |  |  | 15.00% |  |  |  |  |
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity attributable to owners of parent |  | $ 11,010 |  |  |  |  |  |  |  |  |
Proportion of ownership interest sold |  | 15.00% |  |  |  |  |  |  |  |  |
Non-controlling interests recognised, dividends declared accruing unconditionally |  | 20.00% |  |  |  |  |  |  |  |  |
Non-controlling interests recognised, portion recognised to the extent net asset value exceeds faciliation loans |  | 80.00% |  |  |  |  |  |  |  |  |
BETS [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  |  |  |  |  | 10.00% |  |  |  |  |
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity attributable to owners of parent |  | $ 7,340 |  |  |  |  |  |  |  |  |
Proportion of ownership interest sold |  | 10.00% |  |  |  |  |  |  |  |  |
Community Trust [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  | 10.00% |  |  |  | 10.00% |  |  |  |  |
Proportion of ownership interest sold |  | 10.00% |  |  |  |  |  |  |  |  |
Non-controlling interests recognised, dividends declared accruing unconditionally |  | 100.00% |  |  |  |  |  |  |  |  |
Non-controlling interests recognised, portion recognised to the extent net asset value exceeds faciliation loans |  | 80.00% |  |  |  |  |  |  |  |  |
Non-controlling interests recognised, dividends declared accruing unconditionally employee participation |  | 20.00% |  |  |  |  |  |  |  |  |

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