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Note 7 - Share-based Compensation - Share-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based compensation expense $ 597 $ 873 $ 2,437 $ 2,306
Cost of Sales [Member]        
Share-based compensation expense 202 255 685 576
Selling, General and Administrative Expenses [Member]        
Share-based compensation expense $ 395 $ 618 $ 1,752 $ 1,730