Annual report [Section 13 and 15(d), not S-K Item 405]

Note 5 - Stock Incentive Plan - Option Activity (Details)

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Note 5 - Stock Incentive Plan - Option Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Balance (in shares) 421,820 328,605
Balance, exercise price (in dollars per share) $ 20.06 $ 21.39
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 43,523 [1] 101,787
Granted, exercise price (in dollars per share) [1] $ 3.42 $ 15.72
Forfeited (in shares) (19,628) [2],[3] (8,572)
Forfeited, exercise price (in dollars per share) [2] $ 15.88 [3] $ 19.67
Exercised (in shares) (16,800) 0
Exercised, exercise price (in dollars per share) $ 0.005 $ 0
Balance (in shares) 428,915 421,820
Balance, exercise price (in dollars per share) $ 19.35 $ 20.06
Unvested options outstanding expected to vest(3) (in shares) [3] 89,034  
Unvested options outstanding expected to vest(3), exercise price (in dollars per share) [3] $ 10.99  
[1] 43,523 options vest as follows: options to purchase 41,523 shares of the Company’s common stock vest 6/48ths on the six-month anniversary of vesting commencement date and 1/48th per month thereafter; and options to purchase 2,000 shares of the Company’s common stock vest monthly over one year. Exercise prices range from $1.70 to $3.71 per share.
[2] Forfeited options represent unvested shares and vested, expired shares related to employee terminations.
[3] Forfeitures only include known forfeitures to-date as the Company typically accounts for forfeitures as they occur due to a limited history of forfeitures.