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Note 6 - Blanket Zimbabwe Indigenisation Transaction (Details Textual) - USD ($) |  |  |  | 2 Months Ended | 5 Months Ended | 7 Months Ended | 12 Months Ended | 19 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 05, 2018 | Jun. 23, 2017 | Feb. 20, 2012 | Apr. 30, 2013 | Feb. 28, 2013 | Sep. 30, 2012 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jul. 31, 2016 | Dec. 20, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Jun. 22, 2017 | Dec. 31, 2015
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 |  |  | $ 30,090,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest, non-refundable donation |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |
Total borrowings |  |  |  |  |  |  | $ 5,960,000 |  | $ 1,486,000 |  | $ 2,987,000 |  |  |  |  |  |
Percentage of net assets recognised as NCI |  |  | 16.20% |  |  |  | 16.20% |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
Expense from equity-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets |  | $ 806,000 |  |  |  |  | $ 14,000 |  | $ 835,000 | [1] | $ 170,000 |  |  |  |  |  |
Dividends received |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
Cash advances on dividend loans |  |  |  | $ 1,000,000 | $ 1,000,000 | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |
Femiro [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest acquired | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments or interests issued or issuable for cancellation of loan | 727,266 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued or issuable, price per share | 7.15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Femiro [Member] | Facilitation loan [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,468,000 | $ 11,467,000 |  |
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 |  |  | $ 11,740,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  | $ 11,010,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  | $ 7,340,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Blanket Mine (1983) (Private) Limited [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary | 64.00% |  |  |  |  |  | 49.00% | [2],[3] | 49.00% | [2],[3] |  |  |  |  |  |  |
[1] | Restated, refer note 4(a).
[2] | Blanket has no subsidiary companies
[3] | Refer to Note 6, for the effective shareholding. NCI has a 16.2% interest in cash flows of Blanket only.

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