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Note 16 - Tax Expense - Income Tax Components (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Tax recognised in profit or loss      
Current tax $ 9,492 $ 7,311 $ 3,783
Income tax - current year 8,969 6,802 2,523
Income tax - prior year (over)/ under provision (54) 29 1,075
Withholding tax - current year 577 480 580
Withholding tax - prior year overprovision (395)
Deferred tax expense 5,681 2,979 3,662
Origination and reversal of temporary differences 5,681 2,979 3,662
Tax expense – recognised in profit or loss 15,173 10,290 7,445
Tax expense $ 15,173 $ 10,290 $ 7,445