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Note 17 - Tax Expense - Movement in Recognized Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) $ (23,230) [1] $ (19,555)
Recognised in profit or loss (2,979) (3,662)
Foreign exchange movement 23,143 (13)
Deferred tax assets (liabilities) [1] (3,066) (23,230)
Property, plant, and equipment deferred tax liability [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) (24,930) [1] (20,985)
Recognised in profit or loss (4,561) (3,945)
Foreign exchange movement 25,296
Deferred tax assets (liabilities) [1] (4,195) (24,930)
Allowance for obsolete stock deferred tax asset [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 258 [1] 35
Recognised in profit or loss 11 223
Foreign exchange movement (247)
Deferred tax assets (liabilities) [1] 22 258
Prepayments deferred tax liability [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) (3) [1] (4)
Recognised in profit or loss
Foreign exchange movement (1) 1
Deferred tax assets (liabilities) [1] (4) (3)
Unrealised foreign exchange gains (losses) [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 34 [1] 97
Recognised in profit or loss 519 (63)
Foreign exchange movement (244)
Deferred tax assets (liabilities) [1] 309 34
Trade and other payables [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 486 429
Recognised in profit or loss 1,093 57
Foreign exchange movement (840)
Deferred tax assets (liabilities) 739 [1] 486
Share-based payments deferred tax assets [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 13 [1] 12
Recognised in profit or loss (9) 3
Foreign exchange movement 1 (2)
Deferred tax assets (liabilities) [1] 5 13
Provisions [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 852 813
Recognised in profit or loss 11 47
Foreign exchange movement (805) (8)
Deferred tax assets (liabilities) 58 [1] 852
Other temporary differences [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 12 48
Recognised in profit or loss (43) 16
Foreign exchange movement (17) (4)
Deferred tax assets (liabilities) $ 12
[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.