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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