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Note 16 - Tax Expense - Movement in Recognised Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) $ (7,840) $ (4,147)
Recognised in profit or loss (6,838) (5,806)
Foreign exchange movement 9,757 2,103
Deferred tax assets (liabilities) (4,921) (7,840)
Property, plant, and equipment deferred tax liability [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) (9,328) (5,380)
Recognised in profit or loss (8,560) (6,439)
Foreign exchange movement 11,565 2,491
Deferred tax assets (liabilities) (6,323) (9,328)
Evaluation and exploration assets [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) (47) (29)
Recognised in profit or loss 10 (31)
Foreign exchange movement 35 13
Deferred tax assets (liabilities) (2) (47)
Allowance for obsolete stock deferred tax asset [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 3 13
Recognised in profit or loss (295) 3
Foreign exchange movement 129 (13)
Deferred tax assets (liabilities) (163) 3
Prepayments deferred tax liability [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) (10) (3)
Recognised in profit or loss 4 (8)
Foreign exchange movement 1 1
Deferred tax assets (liabilities) (5) (10)
Unrealised foreign exchange gains (losses) [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 499 530
Recognised in profit or loss 1,179 344
Foreign exchange movement (945) (375)
Deferred tax assets (liabilities) 733 499
Trade and other payables [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 989 639
Recognised in profit or loss 794 235
Foreign exchange movement (969) 115
Deferred tax assets (liabilities) 814 989
Provisions [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 54 60
Recognised in profit or loss 30 123
Foreign exchange movement (59) (129)
Deferred tax assets (liabilities) 25 54
Cash-settled awards [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 0 8
Recognised in profit or loss   (8)
Foreign exchange movement   0
Deferred tax assets (liabilities)   0
Other temporary differences [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) $ 0 15
Recognised in profit or loss   (25)
Foreign exchange movement   10
Deferred tax assets (liabilities)   $ 0