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Note 2 - Significant Accounting Policies - Share-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based compensation expense $ 3,155 $ 797 $ 9,787 $ 1,853
Research and Development Expense [Member]        
Share-based compensation expense 935 386 2,682 972
General and Administrative Expense [Member]        
Share-based compensation expense 1,870 411 5,887 881
Cost of Sales [Member]        
Share-based compensation expense $ 350 $ 0 $ 1,218 $ 0