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Note 14 - Tax Expense - Recognised Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Deferred tax asset $ 1,434 $ 1,230  
Deferred tax liability (20,989) (17,095)  
Net deferred tax asset (liability) (19,555) [1] (15,865) [1] $ (11,260)
Property, plant, and equipment deferred tax liability [member]      
Statement Line Items [Line Items]      
Deferred tax asset  
Deferred tax liability (20,985) (17,092)  
Net deferred tax asset (liability) (20,985) [1] (17,092) [1] (12,988)
Allowance for obsolete stock deferred tax asset [member]      
Statement Line Items [Line Items]      
Deferred tax asset 35 12  
Deferred tax liability  
Net deferred tax asset (liability) 35 [1] 12 [1]
Prepayments deferred tax liability [member]      
Statement Line Items [Line Items]      
Deferred tax asset  
Deferred tax liability (4) (3)  
Net deferred tax asset (liability) (4) [1] (3) [1] (3)
Unrealised foreign exchange gains (losses) [member]      
Statement Line Items [Line Items]      
Deferred tax asset 97  
Deferred tax liability  
Net deferred tax asset (liability) [1] 97  
Share-based payments deferred tax assets [member]      
Statement Line Items [Line Items]      
Deferred tax asset 12  
Deferred tax liability  
Net deferred tax asset (liability) [1] 12  
Other temporary differences [member]      
Statement Line Items [Line Items]      
Deferred tax asset 1,290 1,218  
Deferred tax liability  
Net deferred tax asset (liability) $ 1,290 [1] $ 1,218 [1] $ 733
[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.