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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

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