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Note 16 - Tax Expense - Recognised Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Deferred tax asset $ 1,703 $ 1,434  
Deferred tax liability (24,933) (20,989)  
Net deferred tax asset (liability) (23,230) [1] (19,555) [1] $ (15,865)
Property, plant, and equipment deferred tax liability [member]      
Statement Line Items [Line Items]      
Deferred tax asset  
Deferred tax liability (24,930) (20,985)  
Net deferred tax asset (liability) (24,930) [1] (20,985) [1] (17,092)
Allowance for obsolete stock deferred tax asset [member]      
Statement Line Items [Line Items]      
Deferred tax asset 258 35  
Deferred tax liability  
Net deferred tax asset (liability) 258 [1] 35 [1] 12
Prepayments deferred tax liability [member]      
Statement Line Items [Line Items]      
Deferred tax asset  
Deferred tax liability (3) (4)  
Net deferred tax asset (liability) (3) [1] (4) [1] (3)
Unrealised foreign exchange gains (losses) [member]      
Statement Line Items [Line Items]      
Deferred tax asset 34 97  
Deferred tax liability  
Net deferred tax asset (liability) 34 [1] 97 [1]
Share-based payments deferred tax assets [member]      
Statement Line Items [Line Items]      
Deferred tax asset 13 12  
Deferred tax liability  
Net deferred tax asset (liability) 13 [1] 12 [1]
Provisions [member]      
Statement Line Items [Line Items]      
Deferred tax asset 1,386 1,290  
Deferred tax liability  
Net deferred tax asset (liability) 1,386 [1] 1,290 [1] $ 1,218
Other temporary differences [member]      
Statement Line Items [Line Items]      
Deferred tax asset 12  
Deferred tax liability  
Net deferred tax asset (liability) $ 12  
[1] The deferred tax liability consists of a deferred tax asset of $65 (2016: $44) from the South African operations and a deferred tax liability of $19,620 (2016: $15,909) due to the Zimbabwean operations. The amounts are in different tax jurisdictions and cannot offset. The amounts are presented as a Non-current asset and a Non-current liability in the Statement of financial position. The deferred tax asset recognised is supported by evidence of probable future taxable income.