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Note 30 - Financial Instruments - Credit Risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]    
Carrying amount $ 3,649 $ 2,015
Zimbabwean operations [member]    
Statement Line Items [Line Items]    
Carrying amount 3,639 2,015
Other [member]    
Statement Line Items [Line Items]    
Carrying amount $ 10