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Note 17 - Tax Expense - Recognised Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]      
Deferred tax liability $ (4,199) $ (24,933)  
Net deferred tax asset (liability) (3,066) [1] (23,230) [1] $ (19,555)
Deferred tax asset 1,133 1,703  
Property, plant, and equipment deferred tax liability [member]      
Statement Line Items [Line Items]      
Deferred tax liability (4,195) (24,930)  
Net deferred tax asset (liability) (4,195) [1] (24,930) [1] (20,985)
Allowance for obsolete stock deferred tax asset [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) 22 [1] 258 [1] 35
Deferred tax asset 22 258  
Prepayments deferred tax liability [member]      
Statement Line Items [Line Items]      
Deferred tax liability (4) (3)  
Net deferred tax asset (liability) (4) [1] (3) [1] (4)
Unrealised foreign exchange gains (losses) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) 309 [1] 34 [1] 97
Deferred tax asset 309 34  
Trade and other payables [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) 739 [1] 486 429
Deferred tax asset 739    
Share-based payments deferred tax assets [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) 5 [1] 13 [1] 12
Deferred tax asset 5 13  
Provisions [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) 58 [1] 852 813
Deferred tax asset 58 1,386  
Other temporary differences [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) 12 $ 48
Deferred tax asset   $ 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.