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Note 6 - Equity Incentive Plan - Total Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Stock-based compensation expense $ 1,182 $ 817
Cost of Sales [Member]    
Stock-based compensation expense 97 13
Research and Development Expense [Member]    
Stock-based compensation expense 10 102
Selling, General and Administrative Expenses [Member]    
Stock-based compensation expense $ 1,075 $ 702