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Note 6 - Share-based Compensation - Compensation Cost (Details) - Selling, General and Administrative Expenses [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Share-based compensation $ 1,513 $ 1,056
Common Stock [Member]    
Share-based compensation 100 100
Employee and Nonemployee Stock Option [Member]    
Share-based compensation 113 94
Restricted Stock Units (RSUs) [Member]    
Share-based compensation $ 1,300 $ 862