Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Summary of Stock Options - Stock-based Compensation Expense Included in the Statement of Income (Details)

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Note 11 - Summary of Stock Options - Stock-based Compensation Expense Included in the Statement of Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Stock-based compensation expense $ 710 $ 496
Cost of Sales [Member]    
Stock-based compensation expense 60 32
Research and Development Expense [Member]    
Stock-based compensation expense 87 40
Selling, General and Administrative Expenses [Member]    
Stock-based compensation expense $ 564 $ 424