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Note 11 - Share-based Compensation - Share-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based compensation expense $ 2,774 $ 2,707 $ 942
Cost of Goods Sold [Member]      
Share-based compensation expense 143 140 14
Research and Development Expense [Member]      
Share-based compensation expense 953 678 127
Selling, General and Administrative Expenses [Member]      
Share-based compensation expense $ 1,678 $ 1,889 $ 801