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Note 6 - Blanket Zimbabwe Indigenisation Transaction - Facilitation Loans (Details) - USD ($) $ in Thousands | 12 Months Ended | 19 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jul. 31, 2016
Statement Line Items [Line Items] |  |  |
Balance at January 1, 2017 | $ 31,052 |  |
Dividends used to repay loans |  |  | $ 0
Balance at December 31, 2017 | 30,986 | $ 31,052 |
Reserve of share-based payments [member] | Facilitation loans [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at January 1, 2017 | 31,052 | 31,460 |
Interest accrued | 2,173 | 1,136 |
Dividends used to repay loans | (2,239) | (1,544) |
Balance at December 31, 2017 | $ 30,986 | $ 31,052 |

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