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Note 32 - Cash Flow Information - Non-cash Items and Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement Line Items [Line Items]      
Operating profit $ 38,360 $ 40,735 $ 60,889
Impairment of property, plant and equipment 497 0 144
Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss, exploration and evaluation assets 3,837 2,930 0
Expected credit losses on deferred consideration on disposal of subsidiary 761 0 0
Profit on sale of subsidiary 0 0 (5,409)
Unrealised foreign exchange gains (note 13) (2,754) (8,367) (31,307)
Cash-settled share-based expense (note 12.1) 477 1,413 689
Cash-settled share-based expense included in production costs (note 8) 692 634 107
Non-cash portion of cash-settled share-based expense (420) (1) (1,384)
Depreciation 8,046 4,628 4,434
Fair value loss on derivative assets (note 14.1) 105 266 (102)
Fair value loss on derivative liabilities (note 14.1) (135)    
Disposal of property, plant and equipment 0 0 63
Derecognition of property, plant and equipment (38) 182 0
Cash generated from operations before working capital changes 49,698 42,420 28,124
Inventories (4,016) (5,707) (1,655)
Prepayments (4,272) 816 (2,099)
Trade and other receivables (4,746) 539 393
Trade and other payables 2,039 (101) (878)
Cash generated from operations 38,703 37,967 23,885
Derivative liabilities [member]      
Statement Line Items [Line Items]      
Fair value loss on derivative liabilities (note 14.1) $ 135 $ 0 $ 0