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Note 7 - Share-based Compensation - Compensation Cost (Details) - Selling, General and Administrative Expenses [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Share-based compensation $ 897 $ 650 $ 2,370 $ 1,771
Common Stock [Member]        
Share-based compensation 100 100 300 300
Employee and Nonemployee Stock Option [Member]        
Share-based compensation 75 52 188 157
Restricted Stock Units (RSUs) [Member]        
Share-based compensation $ 722 $ 498 $ 1,882 $ 1,314