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Note 17 - Property, Plant and Equipment (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Statement Line Items [Line Items]        
Additions other than through business combinations, property, plant and equipment $ 24,778 $ 20,423    
Borrowing costs capitalised 53 165 $ 61  
Total property, plant and equipment 126,479 106,512 [1] 90,460 $ 90,460 [1]
Construction in progress [member]        
Statement Line Items [Line Items]        
Additions other than through business combinations, property, plant and equipment 15,771 14,051 $ 19,323  
Total property, plant and equipment $ 85,479 $ 69,708   $ 55,657
[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.