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Note 7 - Share-based Compensation - Compensation Cost (Details) - Selling, General and Administrative Expenses [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Share-based compensation $ 1,197 $ 781 $ 2,253 $ 1,473
Common Stock [Member]        
Share-based compensation 100 100 200 200
Employee and Nonemployee Stock Option [Member]        
Share-based compensation 113 60 207 113
Restricted Stock Units (RSUs) [Member]        
Share-based compensation $ 984 $ 621 $ 1,846 $ 1,160