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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%

X

- Definition

The cash outflow for advanced dividend loans made to non-controlling interests.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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- Definition

Amount of non-refundable donation paid by a subsidiary to a community trust.

+ References

No definition available.

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- Definition

NCI are recognised on the portion of shareholding upon which dividends declared accrue unconditionally to equity holders.

+ References

No definition available.

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- Definition

NCI are recognised on the portion of shareholding upon which dividends declared accrue unconditionally to equity holders with employee participation.

+ References

No definition available.

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- Definition

Percentage of NCI recognised to the extent that their attributable share of the net asset value of a subsidiary exceeds the balance on the facilitation loans including interest.

+ References

No definition available.

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- Definition

The percentage of net assets recognised as non-controlling interest.

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- Definition

Percentage of dividends declared that accrue unconditionally to equity holders.

+ References

No definition available.

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- Definition

Percentage of ownership interests sold during the period.

+ References

No definition available.

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- References

No definition available.

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X

- Definition

The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 7
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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- Definition

The increase (decrease) in equity attributable to owners of the parent through changes in ownership interests in subsidiaries that do not result in loss of control. [Refer: Subsidiaries [member]; Equity attributable to owners of parent]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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- Definition

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+ References

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