Note 8 - Stock-based Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Outstanding, options (in shares)	14,062
Outstanding, weighted average exercise price (in dollars per share)	$ 2.83
Outstanding, weighted average remaining contractual term (Year)	6 years 11 months 1 day	6 years 2 months 23 days
Outstanding, aggregate intrinsic value	$ 2,146	$ 579
Granted, options (in shares)	4,482
Granted, weighted average exercise price (in dollars per share)	$ 3.61
Granted, weighted average remaining contractual term (Year)	9 years 10 months 9 days
Granted, aggregate intrinsic value	$ 2
Exercised, options (in shares)	0
Exercised, weighted average exercise price (in dollars per share)	$ 0
Forfeited/canceled, options (in shares)	0
Forfeited/canceled, weighted average exercise price (in dollars per share)	$ 0
Outstanding, options (in shares)	18,544	14,062
Outstanding, weighted average exercise price per share (in dollars per share)	$ 3.02	$ 2.83
Vested, options (in shares)	7,379
Vested, weighted average exercise price per share (in dollars per share)	$ 3.55
Vested, weighted average remaining contractual term (Year)	5 years 2 months 19 days
Vested, aggregate intrinsic value	$ 374		$ 600