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Note 14 - Tax Expense - Income Tax Components (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Tax recognised in profit or loss      
Current tax $ 4,995 $ 3,106 $ (197)
Income tax– current year 3,702 2,414 506
Income tax – Prior year under provision 71 49 (1,636)
Withholding tax expense 1,222 643 933
Deferred tax expense 3,696 4,611 2,567
Origination and reversal of temporary differences 3,696 4,611 2,567
Tax expense – recognised in profit or loss 8,691 7,717 2,370
Tax recognised in other comprehensive income      
Income tax - current year (199)
Tax expense $ 8,691 $ 7,717 $ 2,171