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Note 33 - Non-controlling Interests - Schedule of Non-controlling Interests (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Current assets $ 27,913 $ 25,792  
Non-current assets 82,143 64,917  
Current liabilities 15,602 9,832  
Non-current liabilities 25,243 21,560  
Carrying amount of NCI 5,944 3,708  
Revenue 69,762 61,992 $ 48,977
Profit for the year 11,896 11,085 5,590
Total comprehensive income 12,269 11,347 2,498
Profit allocated to NCI 2,512 2,559 811
Blanket Mine (1983) (Private) Limited [member]      
Statement Line Items [Line Items]      
Current assets 15,559 13,151 10,386
Non-current assets 82,798 65,823 50,613
Current liabilities (16,232) (8,698) (6,497)
Non-current liabilities (23,041) (20,185) (13,621)
Net assets 59,084 50,091 40,881
Carrying amount of NCI 5,944 3,708 1,504
Revenue 69,762 61,992 48,977
Profit for the year 15,506 15,800 5,000
Total comprehensive income 15,506 15,800 5,000
Profit allocated to NCI 2,512 2,559 811
Dividend paid to NCI $ (406) $ (355)