Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Summary of Stock Options - Stock-based Compensation Expense Included in the Statement of Income (Details)

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Note 12 - Summary of Stock Options - Stock-based Compensation Expense Included in the Statement of Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Stock-based compensation expense $ 810 $ 710
Cost of Sales [Member]    
Stock-based compensation expense 55 60
Research and Development Expense [Member]    
Stock-based compensation expense 97 86
Selling, General and Administrative Expenses [Member]    
Stock-based compensation expense $ 658 $ 564