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Note 8 - Share-based Compensation - Compensation Cost (Details) - Selling, General and Administrative Expenses [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Share-based compensation $ 1,539 $ 1,197 $ 4,787 $ 3,450
Common Stock [Member]        
Share-based compensation 100 100 300 300
Employee and Nonemployee Stock Option [Member]        
Share-based compensation 127 112 357 320
Restricted Stock Units (RSUs) [Member]        
Share-based compensation $ 1,312 $ 985 $ 4,130 $ 2,830