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Note 9 - Share-based Compensation - Schedule of Stock-based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Total stock-based compensation $ 779 $ 746
Cost of Sales [Member]    
Total stock-based compensation 81 82
Selling and Marketing Expense [Member]    
Total stock-based compensation 159 158
General and Administrative Expense [Member]    
Total stock-based compensation 454 419
Research and Development Expense [Member]    
Total stock-based compensation $ 85 $ 87