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Note 12 - Equity Incentive Plan - Total Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock-based compensation expense $ 5,807 $ 3,392 $ 2,225
Cost of Sales [Member]      
Stock-based compensation expense 439 148 42
Research and Development Expense [Member]      
Stock-based compensation expense 564 467 269
Selling, General and Administrative Expenses [Member]      
Stock-based compensation expense $ 4,804 $ 2,777 $ 1,914