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Note 8 - Stock-Based Compensation - Summary of Stock Options (Details)
 3 Months Ended
Mar. 31, 2025
$ / shares
shares
Outstanding, options (in shares) | shares 7,638,458
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 5.5
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | shares 842,250
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1.42
Exercised, options (in shares) | shares 0
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 0
Canceled and forfeited, options (in shares) | shares (533,305)
Canceled and forfeited, weighted average exercise price (in dollars per share) | $ / shares $ 5.46
Outstanding, options (in shares) | shares 7,947,403
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 5.07