Quarterly report pursuant to Section 13 or 15(d)

Note 9 - Summary of Stock Options - Stock-based Compensation Expense Included in the Statement of Income (Details)

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Note 9 - Summary of Stock Options - Stock-based Compensation Expense Included in the Statement of Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Stock-based compensation expense $ 765 $ 487 $ 2,294 $ 1,314
Cost of Sales [Member]        
Stock-based compensation expense 19 5 47 12
Research and Development Expense [Member]        
Stock-based compensation expense 79 62 266 170
Selling, General and Administrative Expenses [Member]        
Stock-based compensation expense $ 667 $ 420 $ 1,981 $ 1,132