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Note 5 - Stock-Based Compensation - Fair Value of Vested Restricted Stock Awards (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Restricted Stock [Member]        
Fair value of instrument vested $ 308 $ 613 $ 2,069 $ 2,071