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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Stock-based compensation expense $ 867 $ 657 $ 1,677 $ 1,367
Cost of Sales [Member]        
Stock-based compensation expense 60 61 115 121
Research and Development Expense [Member]        
Stock-based compensation expense 102 85 200 171
Selling, General and Administrative Expenses [Member]        
Stock-based compensation expense $ 705 $ 511 $ 1,362 $ 1,075