Note 9 - Stockholders' Equity - Summary of Stock Option Activity for Stock Option Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Outstanding, shares (in shares)	3,021,298
Outstanding, weighted average exercise price (in dollars per share)	$ 4.25
Outstanding, aggregate intrinsic value	$ 810		$ 466
Granted, shares (in shares)	203,791
Granted, weighted average exercise price (in dollars per share)	$ 2.32	$ 1.52
Exercised, shares (in shares)	0
Exercised, weighted average exercise price (in dollars per share)	$ 0
Exercised, aggregate intrinsic value	$ 0
Cancelled (in shares)	(160,411)
Cancelled, weighted average exercise price (in dollars per share)	$ 8.58
Outstanding, shares (in shares)	3,064,678
Outstanding, weighted average exercise price (in dollars per share)	$ 3.9
Options Exercisable (in shares)	2,063,823		1,962,416
Options Exercisable, weighted average exercise price (in dollars per share)	$ 4.96		$ 5.59
Options Exercisable, aggregate intrinsic value	$ 409		$ 192