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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, 2020
Dec. 31, 2019
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) $ (3,066) [1] $ (23,230)
Recognised in profit or loss (5,681) (2,979)
Foreign exchange movement 4,600 23,143
Deferred tax assets (liabilities) [1] (4,147) (3,066)
Property, plant, and equipment deferred tax liability [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) (4,195) [1] (24,930)
Recognised in profit or loss (7,195) (4,561)
Foreign exchange movement 5,981 25,296
Deferred tax assets (liabilities) [1] (5,409) (4,195)
Allowance for obsolete stock deferred tax asset [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 22 [1] 258
Recognised in profit or loss 14 11
Foreign exchange movement (23) (247)
Deferred tax assets (liabilities) [1] 13 22
Prepayments deferred tax liability [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) (4) [1] (3)
Recognised in profit or loss
Foreign exchange movement 1 (1)
Deferred tax assets (liabilities) [1] (3) (4)
Unrealised foreign exchange gains (losses) [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 309 [1] 34
Recognised in profit or loss 732 519
Foreign exchange movement (511) (244)
Deferred tax assets (liabilities) [1] 530 309
Trade and other payables [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 739 [1] 486
Recognised in profit or loss 674 1,093
Foreign exchange movement (774) (840)
Deferred tax assets (liabilities) 639 739 [1]
Cash-settled awards [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 5 13
Recognised in profit or loss 3 (9)
Foreign exchange movement 1
Deferred tax assets (liabilities) 8 5
Provisions [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 58 [1] 852
Recognised in profit or loss 76 11
Foreign exchange movement (74) (805)
Deferred tax assets (liabilities) [1] 60 58
Other temporary differences [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) [1] 60
Recognised in profit or loss 15 (43)
Foreign exchange movement (17)
Deferred tax assets (liabilities) $ 15 [1]
[1] The deferred tax liability consists of a deferred tax asset of $63 (2018: $98) from the South African operation and a net deferred tax liability of $3,129 (2018: $23,328) due to the Zimbabwean operation. The amounts are in different tax jurisdictions and cannot be offset. The amounts are presented as part of Non-current assets and a Non-current liabilities in the Statements of financial position. The deferred tax asset recognised is supported by evidence of probable future taxable income.