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Note 5 - Stock-Based Compensation - Fair Value of Vested Restricted Stock Units (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Restricted Stock Units (RSUs) [Member]        
Fair value of instrument vested $ 1,356 $ 1,486 $ 4,403 $ 3,313