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Note 12 - Leases - Financial Statement Amounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]      
Finance cost on lease liabilities $ 15 $ 17
Unrealised foreign exchange gain (2) 4  
Depreciation 99 112  
Lease expense 112 133  
Total cash outflow for leases - principal 118 124 [1] [1]
Total cash outflow for leases - finance cost $ (15) $ (17)  
[1] 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.