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Note 31 - Group Entities (Details Textual)
12 Months Ended
Feb. 20, 2012
Dec. 31, 2017
Statement Line Items [Line Items]    
Proportion of ownership interests held by non-controlling interests 51.00% 51.00%
Blanket Mine (1983) (Private) Limited [member]    
Statement Line Items [Line Items]    
Proportion of ownership interests held by non-controlling interests   16.20%