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Note 16 - Tax Expense - Tax Paid (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Net income tax (payable)/receivable at January 1 $ (1,145) $ (345) $ 344
Current tax expense (3,783) (4,995) (3,106)
Foreign currency movement 46 (17) (49)
Tax paid 3,344 4,212 2,466
Net income tax payable at December 31 $ (1,538) $ (1,145) $ (345)