Note 6 - Stockholders' Equity and Stock-based Compensation - Summary of Warrants Activity (Details)	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Warrants outstanding, number of shares (in shares) | shares	7,303,832
Warrants outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 2.05
Warrants outstanding, weighted average remaining contractual life (Year)	4 years 5 months 4 days
Warrants issued, number of shares (in shares) | shares	0
Warrants issued, weighted average exercise price (in dollars per share) | $ / shares	$ 0
Warrants exercised, number of shares (in shares) | shares	(7,237,657)
Warrants exercised (in dollars per share) | $ / shares	$ 2.05
Warrants Expired/Redeemed, number of shares (in shares) | shares	(66,175)
Warrants Expired/Redeemed, weighted average exercise price (in dollars per share) | $ / shares	$ 2.05
Warrants outstanding, number of shares (in shares) | shares	0
Warrants outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 0