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Note 5 - Blanket Zimbabwe Indigenization Transaction - Facilitation Loans (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Statement Line Items [Line Items]    
Balance at January 1, [1] $ 30,974  
Balance at June 30, 19,422  
Reserve of share-based payments [member] | Facilitation loans [member]    
Statement Line Items [Line Items]    
Balance at January 1, 1,632 $ 2,053
Dividends used to repay loans (336) (175)
Interest accrued 53 37
Balance at June 30, $ 1,349 $ 1,915
[1] Facilitation loans are accounted for as equity instruments and are accordingly not recognised as loans receivable.