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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Stock-based compensation expense $ 776 $ 455 $ 1,529 $ 827
Cost of Sales [Member]        
Stock-based compensation expense 17 4 28 7
Research and Development Expense [Member]        
Stock-based compensation expense 65 57 187 108
Selling, General and Administrative Expenses [Member]        
Stock-based compensation expense $ 694 $ 394 $ 1,314 $ 712