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Note 5 - Blanket Zimbabwe Indigenisation Transaction - Movement in Advance Dividend Loan (Details) - USD ($) $ in Thousands | 12 Months Ended | 19 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Jul. 31, 2016
Statement Line Items [Line Items] |  |  |
Dividends used to repay loans |  |  | $ 0
Reserve of share-based payments [member] | Advanced dividend loans [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at January 1, 2016 | $ 3,000 | $ 3,237 |
Interest accrued | 104 | 133 |
Dividends used to repay loans | (500) | (370) |
Balance at December 31, 2016 | $ 2,604 | $ 3,000 |

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