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Note 11 - Other Expenses - Components of Other Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Impairment - 2017 royalty rebate $ 181 [1]
[1] Restated, refer note 4(a).