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Note 6 - Blanket Zimbabwe Indigenisation Transaction - Facilitation Loans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement Line Items [Line Items]    
Balance [1] $ 30,974  
Balance 19,175 $ 30,974 [1]
Reserve of share-based payments [member] | Facilitation loans [member]    
Statement Line Items [Line Items]    
Balance 1,632 2,053
Finance cost accrued 98 104
Dividends used to repay loans (736) (525)
Balance $ 994 $ 1,632
[1] Facilitation loans are accounted for as equity instruments and are accordingly not recognised as loans receivable.