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Note 5 - Blanket Zimbabwe Indigenisation Transaction - Facilitation Loans (Details) - USD ($)
$ in Thousands
 12 Months Ended 19 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Jul. 31, 2016
Statement Line Items [Line Items]      
Balance at January 1, 2016 $ 31,460    
Dividends used to repay loans     $ 0
Balance at December 31, 2016 31,052 $ 31,460  
Reserve of share-based payments [member] | Facilitation loans [member]      
Statement Line Items [Line Items]      
Balance at January 1, 2016 31,460 31,336  
Interest accrued 1,136 1,359  
Dividends used to repay loans (1,544) (1,235)  
Balance at December 31, 2016 $ 31,052 $ 31,460