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Note 16 - Tax Expense - Movement in Recognized Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) $ (19,555) [1] $ (15,865)
Recognised in profit or loss (3,662) (3,696)
Foreign exchange movement (13) 6
Deferred tax assets (liabilities) [1] (23,230) (19,555)
Property, plant, and equipment deferred tax liability [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) (20,985) [1] (17,092)
Recognised in profit or loss (3,945) (3,893)
Foreign exchange movement
Deferred tax assets (liabilities) [1] (24,930) (20,985)
Allowance for obsolete stock deferred tax asset [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 35 [1] 12
Recognised in profit or loss 223 23
Foreign exchange movement
Deferred tax assets (liabilities) [1] 258 35
Prepayments deferred tax liability [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) (4) [1] (3)
Recognised in profit or loss (1)
Foreign exchange movement 1
Deferred tax assets (liabilities) [1] (3) (4)
Unrealised foreign exchange gains (losses) [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 97 [1]
Recognised in profit or loss (63) 97
Foreign exchange movement
Deferred tax assets (liabilities) [1] 34 97
Share-based payments deferred tax assets [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 12 [1]
Recognised in profit or loss 3 12
Foreign exchange movement (2)
Deferred tax assets (liabilities) [1] 13 12
Provisions [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 1,290 [1] 1,218
Recognised in profit or loss 104 66
Foreign exchange movement (8) 6
Deferred tax assets (liabilities) [1] 1,386 1,290
Other temporary differences [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities)  
Recognised in profit or loss 16  
Foreign exchange movement (4)  
Deferred tax assets (liabilities) $ 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.