Note 8 - Stock-based Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 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 10 months 13 days	6 years 2 months 23 days
Outstanding, aggregate intrinsic value	$ 12,890	$ 579
Granted, options (in shares)	4,592
Granted, weighted average exercise price (in dollars per share)	$ 3.61
Granted, weighted average remaining contractual term (Year)	9 years 3 months 14 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)	(1,491)
Forfeited/canceled, weighted average exercise price (in dollars per share)	$ 2.32
Outstanding, options (in shares)	17,163
Outstanding, weighted average exercise price per share (in dollars per share)	$ 3.08
Vested, options (in shares)	9,228
Vested, weighted average exercise price per share (in dollars per share)	$ 3.39
Vested, weighted average remaining contractual term (Year)	5 years 1 month 28 days
Vested, aggregate intrinsic value	$ 5,977		$ 100