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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Stock-based compensation expense $ 1,088 $ 642 $ 2,765 $ 2,009
Cost of Sales [Member]        
Stock-based compensation expense 76 42 191 163
Research and Development Expense [Member]        
Stock-based compensation expense 131 78 330 250
Selling, General and Administrative Expenses [Member]        
Stock-based compensation expense $ 881 $ 522 $ 2,244 $ 1,596