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Note 7 - Share-based Compensation - Share-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 expense $ 1,143 $ 973 $ 1,840 $ 1,433
Cost of Sales [Member]        
Share-based compensation expense 253 179 483 321
Selling, General and Administrative Expenses [Member]        
Share-based compensation expense $ 890 $ 794 $ 1,357 $ 1,112