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Note 16 - Tax Expense - Income Tax Components (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Tax recognised in profit or loss      
Current tax $ 3,783 $ 4,995 $ 3,106
Income tax– current year 2,523 3,702 2,414
Income tax – Prior year under provision 1,075 71 49
Withholding tax expense – current year 580 1,222 643
Withholding tax expense – Prior year over provision (395)
Deferred tax expense 3,662 3,696 4,611
Origination and reversal of temporary differences 3,662 3,696 4,611
Tax expense – recognised in profit or loss 7,445 8,691 7,717
Tax expense $ 7,445 $ 8,691 $ 7,717