Note 11 - Equity Incentive Plan - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Outstanding, shares (in shares)	1,812,729
Outstanding, Weighted Average Exercise (in dollars per share)	$ 33.42
Outstanding, shares	$ 316	$ 127
Granted, shares (in shares)	426,925
Granted, Weighted Average Exercise Price (in dollars per share)	$ 27.93
Exercised, shares (in shares)	(1,089)
Exercised, Weighted Average Exercise Price (in dollars per share)	$ 21.77
Exercised, Aggregate Intrinsic Value	$ 4
Forfeited and canceled, shares (in shares)	(26,128)
Forfeited and canceled, weighted average exercise price (in dollars per share)	$ 29.99
Forfeited and canceled, aggregate intrinsic value	$ 22
Outstanding, shares (in shares)	2,212,437
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 32.41
Outstanding, Weighted Average Remaining Contractual Term (Year)	7 years 9 months 18 days
Vested, shares (in shares)	1,305,902
Vested, Weighted Average Exercise Price (in dollars per share)	$ 35.24
Vested, Weighted Average Remaining Contractual Term (Year)	6 years 9 months 18 days
Vested, Aggregate Intrinsic Value	$ 38
Vested and expected to vest, shares (in shares)	2,212,437
Vested and expected to vest, Weighted Average Exercise Price (in dollars per share)	$ 32.41
Vested and expected to vest, Weighted Average Remaining Contractual Term (Year)	7 years 9 months 18 days
Vested and expected to vest, Aggregate Intrinsic Value	$ 316