Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Stockholder's Equity - Stock-based Compensation Expense (Details)

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Note 10 - Stockholder's Equity - Stock-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
Stock-based compensation expense $ 520 $ 901 $ 2,032 $ 2,899
Cost of Sales [Member]        
Stock-based compensation expense 23 32 67 124
Research and Development Expense [Member]        
Stock-based compensation expense 24 34 124 168
General and Administrative Expense [Member]        
Stock-based compensation expense $ 473 $ 835 $ 1,841 $ 2,607