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Note 18 - Exploration and Evaluation Assets (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 16, 2020
Nov. 24, 2020
Nov. 19, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Statement Line Items [Line Items]              
Decrease in exploration and evaluation assets from reallocation to assets held for sale [1]       $ 500      
Assets arising from exploration for and evaluation of mineral resources       6,768 $ 7,139 [2] $ 6,967 $ 6,967 [2]
Impairment loss recognised in profit or loss, exploration and evaluation assets [1]       2,930      
Total non-current assets or disposal groups classified as held for sale or as held for distribution to owners       500 [2]   296 [2]
Cash flows from (used in) exploration for and evaluation of mineral resources, classified as investing activities       (2,759) (172) [3] [3]  
Total trade and other current payables       8,664 8,348 [2]   10,051 [2]
Eagle Vulture, Mascot and Penzance [member]              
Statement Line Items [Line Items]              
Total non-current assets or disposal groups classified as held for sale or as held for distribution to owners       500    
Eagle Vulture, Mascot and Penzance [member]              
Statement Line Items [Line Items]              
Decrease in exploration and evaluation assets from reallocation to assets held for sale [1]       500      
Assets arising from exploration for and evaluation of mineral resources       3,416 3,344  
Impairment loss recognised in profit or loss, exploration and evaluation assets [1]       2,930      
Eagle Vulture, Mascot and Penzance [member] | Gross carrying amount [member]              
Statement Line Items [Line Items]              
Assets arising from exploration for and evaluation of mineral resources       3,430      
Glen Hume [Member]              
Statement Line Items [Line Items]              
Decrease in exploration and evaluation assets from reallocation to assets held for sale [1]            
Assets arising from exploration for and evaluation of mineral resources       2,661  
Impairment loss recognised in profit or loss, exploration and evaluation assets [1]            
Period of option agreement (Month)     1 year 90 days        
Cash flows from (used in) exploration for and evaluation of mineral resources, classified as investing activities   $ (2,500)          
Expected exploration and evaluation of mineral resources expenses   1,000          
Option agreement exercise expense   $ 2,500          
Percentage of net smelter royalty   1.00%          
Option agreement, net smelter royalty buy-out, first five years   $ 15,000          
Option agreement, net smelter royalty buy-out, five to ten years   10,000          
Option agreement, net smelter royalty buy-out, after ten years   $ 5,000          
Connemara North [Member]              
Statement Line Items [Line Items]              
Decrease in exploration and evaluation assets from reallocation to assets held for sale [1]            
Assets arising from exploration for and evaluation of mineral resources       300  
Impairment loss recognised in profit or loss, exploration and evaluation assets [1]            
Period of option agreement (Month) 1 year 180 days            
Option agreement exercise expense $ 600            
Percentage of net smelter royalty 1.00%            
Total trade and other current payables $ 300            
Option agreement exercise expense within seven days of transfer of ownership $ 4,400            
[1] Management determined the fair value of Eagle Vulture, Mascot and Penzance as the future sale price as agreed by independent parties in the sale contract that amounted to $500. The carrying amount of Eagle Vulture, Mascot and Penzance before the impairment was $3,430 and the write down resulted in an impairment expense of $2,930. The $500 carrying value was reallocated to Assets held for sale in December, 2020.
[2] 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.
[3] The Group voluntarily changed its disclosure policy for exploration and evaluation assets to be disclosed separately as Acquisition of exploration and evaluation assets rather than as part of Acquisition of property, plant and equipment (refer to note 4(b)(i)). The new disclosure policy was adopted from December 10, 2020 and has been applied retrospectively.