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Note 12 - Equity Incentive Plan - Allocation of Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock-based compensation expenses $ 3,392 $ 2,225 $ 1,607
Cost of Sales [Member]      
Stock-based compensation expenses 148 42 61
Research and Development Expense [Member]      
Stock-based compensation expenses 467 269 202
Selling, General and Administrative Expenses [Member]      
Stock-based compensation expenses $ 2,777 $ 1,914 $ 1,344