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Note 36 - Non-controlling Interests - Schedule of Non-controlling Interests (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Current assets $ 28,168 $ 27,913  
Non-current assets 97,525 82,143  
Current liabilities (12,198) (15,602)  
Non-current liabilities (34,687) (25,243)  
Non-controlling interests 8,345 5,944  
Revenue 68,399 69,762 [1] $ 61,992
Profit after tax 13,756 11,896 11,085
Total comprehensive income 13,080 12,269 11,347
Profit allocated to NCI 2,990 2,512 2,559
Blanket Mine (1983) (Private) Limited [member]      
Statement Line Items [Line Items]      
Current assets 19,107 15,559 13,151
Non-current assets 98,700 82,798 65,823
Current liabilities (13,200) (16,232) (8,698)
Non-current liabilities (33,043) (23,041) (20,185)
Net assets 71,564 59,084 50,091
Non-controlling interests 8,345 5,944 3,708
Revenue 68,399 69,762 61,992
Profit after tax 18,456 15,506 15,800
Total comprehensive income 18,456 15,506 15,800
Profit allocated to NCI 2,990 2,512 2,559
Dividend to NCI $ (589) $ (406) $ (355)
[1] Restated, refer note 4(a).