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Note 8 - Share-based Compensation - Compensation Cost (Details) - Selling, General and Administrative Expenses [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Share-based compensation $ 2,285 $ 1,736 $ 4,497 $ 3,249
Common Stock [Member]        
Share-based compensation 100 100 200 200
Employee and Nonemployee Stock Option [Member]        
Share-based compensation 65 118 173 230
Restricted Stock Units (RSUs) [Member]        
Share-based compensation $ 2,120 $ 1,518 $ 4,124 $ 2,819