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Note 14 - Tax Expense - Movement in Recognized Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) $ (15,865) [1] $ (11,260)
Recognised in profit or loss (3,696) (4,611)
Foreign exchange movement 6 6
Deferred tax assets (liabilities) [1] (19,555) (15,865)
Property, plant, and equipment deferred tax liability [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) (17,092) [1] (12,988)
Recognised in profit or loss (3,893) (4,104)
Foreign exchange movement
Deferred tax assets (liabilities) [1] (20,985) (17,092)
Allowance for obsolete stock deferred tax asset [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 12 [1]
Recognised in profit or loss 23 12
Foreign exchange movement
Deferred tax assets (liabilities) [1] 35 12
Prepayments deferred tax liability [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) (3) [1] (3)
Recognised in profit or loss (1) 2
Foreign exchange movement (2)
Deferred tax assets (liabilities) [1] (4) (3)
Unrealised foreign exchange gains (losses) [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) [1]  
Recognised in profit or loss 97  
Foreign exchange movement  
Deferred tax assets (liabilities) [1] 97
Other temporary differences [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 1,218 [1] 733
Recognised in profit or loss 66 477
Foreign exchange movement 6 8
Deferred tax assets (liabilities) [1] 1,290 1,218
Share-based payments deferred tax assets [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) [1]  
Recognised in profit or loss 12  
Foreign exchange movement  
Deferred tax assets (liabilities) [1] 12
Assessed tax losses deferred tax asset [member]    
Statement Line Items [Line Items]    
Deferred tax assets (liabilities) 998
Recognised in profit or loss   (998)
Foreign exchange movement  
Deferred tax assets (liabilities)  
[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.