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Note 6 - Equity Incentive Plans - Schedule of Fair Value of Options Granted (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Weighted-average exercise price per share $ 4.54 $ 20.85
Weighted-average expected term (years) 5 years 7 months 24 days 5 years 7 months 28 days
Weighted-average risk-free interest rate 4.03% 4.08%
Weighted-average expected dividend yield $ 0 $ 0
Weighted-average volatility 111.74% 78.35%