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Note 5 - Stock-based Compensation - Fair Value of Vested Restricted Stock Awards (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Restricted Stock [Member]        
Fair value of instrument vested $ 295 $ 1,211 $ 596 $ 1,761