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Note 8 - Capital Stock and Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based compensation $ 1,164 $ 769 $ 2,132 $ 1,562
Continuing Operations [Member] | Cost of Sales [Member]        
Share-based compensation 31 14 51 24
Continuing Operations [Member] | Selling and Marketing Expense [Member]        
Share-based compensation 131 62 224 113
Continuing Operations [Member] | General and Administrative Expense [Member]        
Share-based compensation 969 645 1,803 1,341
Continuing Operations [Member] | Research and Development Expense [Member]        
Share-based compensation $ 33 $ 48 $ 54 $ 84