Note 5 - Common Stock - Summary of Stock Option Activity (Details)	3 Months Ended
	Mar. 31, 2024 $ / shares shares
Outstanding, options (in shares) | shares	134,145
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 2.86
Granted, options (in shares) | shares	37,875
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 3.33
Outstanding, options (in shares) | shares	172,020
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 3.1