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Note 8 - Capital Stock and Stock-based Compensation - Stock-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 $ 1,004 $ 1,079 $ 3,136 $ 2,641
Continuing Operations [Member] | Cost of Sales [Member]        
Share-based compensation 32 19 83 43
Continuing Operations [Member] | Selling and Marketing Expense [Member]        
Share-based compensation 149 92 373 205
Continuing Operations [Member] | General and Administrative Expense [Member]        
Share-based compensation 790 908 2,593 2,249
Continuing Operations [Member] | Research and Development Expense [Member]        
Share-based compensation $ 33 $ 60 $ 87 $ 144