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Note 20 - Reserves (Tables)
12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of reserves within equity [text block]
    2017     2016     2015  
Foreign currency translation reserve    
(5,885
)    
(6,258
)    
(6,520
)
Equity-settled share-based payment reserve (Note 23.1)    
16,746
     
16,041
     
15,871
 
Contributed surplus    
132,591
     
132,591
     
132,591
 
Total    
143,452
     
142,374
     
141,942