Note 12 - Share-based Compensation - Information Regarding Stock Options Outstanding (Details)	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Exercise Price Range One [Member]
Exercise price, lower range limit (in dollars per share)	$ 1
Exercise price, upper range limit (in dollars per share)	$ 2
Options, number outstanding (in shares) | shares	2,084,503
Options outstanding, weighted average remaining contractual life (Year)	9 years 7 months 2 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 1.44
Options exercisable (in shares) | shares	75,527
Options exercisable, weighted average exercise price (in dollars per share)	$ 1.79
Exercise Price Range Two [Member]
Exercise price, lower range limit (in dollars per share)	2.01
Exercise price, upper range limit (in dollars per share)	$ 3
Options, number outstanding (in shares) | shares	1,675,699
Options outstanding, weighted average remaining contractual life (Year)	8 years
Options outstanding, weighted average exercise price (in dollars per share)	$ 2.76
Options exercisable (in shares) | shares	487,967
Options exercisable, weighted average exercise price (in dollars per share)	$ 2.69
Exercise Price Range Three [Member]
Exercise price, lower range limit (in dollars per share)	3.01
Exercise price, upper range limit (in dollars per share)	$ 4
Options, number outstanding (in shares) | shares	250,000
Options outstanding, weighted average remaining contractual life (Year)	10 years
Options outstanding, weighted average exercise price (in dollars per share)	$ 3.1
Options exercisable (in shares) | shares	0
Options exercisable, weighted average exercise price (in dollars per share)	$ 0
Exercise Price Range Four [Member]
Exercise price, lower range limit (in dollars per share)	4.01
Exercise price, upper range limit (in dollars per share)	$ 25
Options, number outstanding (in shares) | shares	647,433
Options outstanding, weighted average remaining contractual life (Year)	5 years 6 months 25 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 5.39
Options exercisable (in shares) | shares	597,086
Options exercisable, weighted average exercise price (in dollars per share)	$ 5.39