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Note 5 - Blanket Zimbabwe Indigenisation Transaction - Facilitation Loans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Statement Line Items [Line Items]    
Balance [1] $ 19,175  
Balance 16,712 $ 19,175 [1]
Reserve of share-based payments [member] | Facilitation loans [member]    
Statement Line Items [Line Items]    
Balance 994 1,632
Finance cost accrued 29 98
Dividends used to repay loan (1,023) (736)
Balance $ 0 $ 994
[1] Facilitation loans are accounted for as equity instruments and are accordingly not recognised as loans receivable.