Note 5 - Stock Incentive Plan - Option Activity (Details) - $ / shares		9 Months Ended
		Sep. 30, 2024	Jun. 30, 2024	Jan. 01, 2024
Balances (in shares)		428,915		421,820
Balances, exercise price (in dollars per share)		$ 19.35		$ 20.06
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	[1]	43,523
Granted, exercise price (in dollars per share)	[1]	$ 3.42
Forfeited(2) (in shares)	[2]	(19,628)
Forfeited, exercise price (in dollars per share)	[2]	$ 15.88
Exercised, options (in shares)		(16,800)
Exercised, exercise price (in dollars per share)		$ 0.005
Unvested options outstanding expected to vest(3) (in shares)	[3]		104,425
Unvested options outstanding expected to vest(3), exercise price (in dollars per share)	[3]		$ 11.38

[1] 78,592 options vest as follows: options to purchase 10,000 shares of the Company’s common stock vest monthly over one year; options to purchase 68,592 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.

[2] There were no forfeitures during the six months ended June 30, 2024.

[3] Forfeitures only include known forfeitures to-date as the Company accounts for forfeitures as they occur due to a limited history of forfeitures.