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Note 14 - Tax Expense - Taxes Paid (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Net income tax (payable)/receivable at January 1 $ (345) $ 344 $ (1,617)
Current tax (expense)/tax credit (4,995) (3,106) 197
Income tax recognised through other comprehensive income 199
Foreign currency movement (17) (49) 103
Tax paid 4,212 2,466 1,462
Net income tax payable at December 31 $ (1,145) $ (345) $ 344