v3.25.1
Note 6 - Stockholders' Equity and Stock-based Compensation - Summary of Stock Option Activity (Details) - The 2015 Plan, 2017 Plan and Inducement Plan [Member] - $ / shares
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Options balances, number of shares (in shares) 10,979,332  
Options balances, weighted average exercise price (in dollars per share) $ 9.59  
Options balances, weighted average remaining life (Year) 7 years 5 months 19 days 7 years 1 month 9 days
Options granted, number of shares (in shares) 2,605,100  
Options granted, weighted average exercise price (in dollars per share) $ 18.94  
Options exercised, number of shares (in shares) (51,000)  
Options exercised, weighted average exercise price (in dollars per share) $ 7.45  
Options canceled, number of shares (in shares) (40,000)  
Options canceled, weighted average exercise price (in dollars per share) $ 15.1  
Options expired, number of shares (in shares) 0  
Options expired, weighted average exercise price (in dollars per share) $ 0  
Options balances, number of shares (in shares) 13,493,432 10,979,332
Options balances, weighted average exercise price (in dollars per share) $ 11.38 $ 9.59
Options exercisable, number of shares (in shares) 4,747,130  
Options exercisable, weighted average exercise price (in dollars per share) $ 12.75  
Options exercisable, weighted average remaining life (Year) 4 years 11 months 23 days