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Note 6 - Blanket Zimbabwe Indigenisation Transaction (Details Textual) - USD ($) $ in Thousands |  |  |  |  | 2 Months Ended | 5 Months Ended | 7 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 20, 2020 | Nov. 05, 2018 | Jun. 23, 2017 | Feb. 20, 2012 | Apr. 30, 2013 | Feb. 28, 2013 | Sep. 30, 2012 | Dec. 31, 2020 | Feb. 27, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  |  |  |  | 51.00% |  |  |  | 36.00% |  |  |  |
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% |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 7.25% |  |  |  |  |  |  |  |  |
Percentage of net assets recognised as NCI |  | 13.20% |  |  | 16.20% |  |  |  | 13.20% |  |  | 16.20% | 16.20%
Proportion of ownership interest acquired |  |  | 15.00% |  |  |  |  |  |  |  |  |  |
Number of instruments or interests issued or issuable for cancellation of loan (in shares) |  | 727,266 |  |  |  |  |  |  |  |  |  |  |
Non-controlling interests derecognized |  | $ 3,600 |  |  |  |  |  |  |  |  |  |  |
Reserve of share-based payments, increase (decrease) during period |  | $ 2,247 |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  | 64.00% |  |  |  |  |  |  |  |  |  |  |
Cash advances on dividend loans |  |  |  |  |  | $ 1,000 | $ 1,000 | $ 2,000 |  |  |  |  |
Advancement of dividend loan [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend loan, percent accrual |  |  |  |  |  |  |  |  |  |  | 20.00% |  |
Dividend loan, percent repaid |  |  |  |  |  |  |  |  |  |  | 80.00% |  |
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% |  |  |  |  |  |  |  |
Fremiro [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  |  |  |  | 15.00% |  |  |  |  | [1] |  |  |
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 | [2] |  |  |  |  |  |  |  | 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% |  |  |  |  |  |  |  |
[1] | After Fremiro repurchase on January 20, 2020.
[2] | Accounted for under IAS19 Employee Benefits.

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