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Note 13 - Finance Income and Finance Costs - Components of Finance Income and Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Interest received – Bank $ 38 $ 16 $ 1
Finance cost      
Interest paid – Term loan 155 103
Interest paid – Capitalised to Property, plant and equipment (note 15) (155) (103)
Interest paid - Bank 49
Interest paid – South African Revenue Service 344
Unwinding of rehabilitation provision 25 25 43
Finance charges – Overdraft 44 167 100
Finance cost $ 69 $ 192 $ 536