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Note 6 - Equity Incentive Plan - Total Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Stock-based compensation expense $ 7,565 $ 1,182
Cost of Sales [Member]    
Stock-based compensation expense (216) 97
Research and Development Expense [Member]    
Stock-based compensation expense 210 10
Selling, General and Administrative Expenses [Member]    
Stock-based compensation expense $ 7,571 $ 1,075