Note 6 - Stockholders' Equity and Stock-based Compensation - Summary of Warrants Activity (Details)	12 Months Ended
	Dec. 31, 2022 $ / shares shares
Warrants outstanding, number of shares (in shares) | shares	0
Warrants outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 0
Warrants issued, number of shares (in shares) | shares	7,317,072
Warrants issued, weighted average exercise price (in dollars per share) | $ / shares	$ 2.05
Warrants exercised, number of shares (in shares) | shares	(13,240)
Warrants exercised (in dollars per share) | $ / shares	$ 2.05
Warrants Expired/Redeemed, number of shares (in shares) | shares	0
Warrants Expired/Redeemed, weighted average exercise price (in dollars per share) | $ / shares	$ 0
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