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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Stock-based compensation expense $ 658 $ 621 $ 1,367 $ 1,117
Cost of Sales [Member]        
Stock-based compensation expense 61 34 121 66
Research and Development Expense [Member]        
Stock-based compensation expense 85 53 171 93
Selling, General and Administrative Expenses [Member]        
Stock-based compensation expense $ 512 $ 534 $ 1,075 $ 958