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Note 27 - Non-controlling Interests - Schedule of Non-controlling Interests (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
 [1]
Statement Line Items [Line Items]        
Current assets $ 44,586 $ 29,839 [1]   $ 28,168
Non-current assets 133,334 113,714 [1]   97,525
Current liabilities (9,964) (9,879) [1]   (12,198)
Non-current liabilities (9,913) (8,957) [1]   (34,687)
Non-controlling interests 16,524 16,302 [1]   $ 8,345
Revenue 100,002 75,826 $ 68,399  
Profit after tax 25,257 50,401 13,756  
Total comprehensive income of Blanket Mine (100%) 25,084 48,341 13,080  
Profit allocated to NCI (2020: 13.2%, 2019: 16.2%, 2018: 16.2%) 4,477 8,383 2,990  
Blanket Mine (1983) (Private) Limited [member]        
Statement Line Items [Line Items]        
Current assets 24,864 21,386 19,107  
Non-current assets 133,908 115,610 98,700  
Current liabilities 7,339 (8,630) (13,200)  
Non-current liabilities (8,065) (9,085) (33,043)  
Net assets of Blanket Mine (100%) 158,046 119,281 71,564  
Non-controlling interests 16,524 16,302 8,345  
Revenue 100,002 75,826 68,399  
Profit after tax 33,361 51,746 18,456  
Total comprehensive income of Blanket Mine (100%) 33,361 51,746 18,456  
Profit allocated to NCI (2020: 13.2%, 2019: 16.2%, 2018: 16.2%) 4,477 8,383 2,990  
Dividend allocated to NCI (2020: 13.2%, 2019: 16.2%, 2018: 16.2%) $ (655) $ (426) $ (589)  
[1] The Group voluntarily changed its disclosure policy for exploration and evaluation assets to be disclosed separately as Exploration and evaluation assets rather than as part of Property, plant and equipment; similarly lease liabilities were classified separately from trade and other payables (refer to note 4(b)(i) and 4(b)(ii)). The new disclosure policies were adopted from December, 2020 and have been applied retrospectively.