Note 4 - Warrants - Warrant Activity (Details) - Liability Classified Warrants [Member] - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Balance (in shares)	1,082,895
Balance, weighted average remaining contractual life (Year)	4 years 4 months 24 days	5 years 1 month 6 days
Expired warrants (in shares)	(75,909)
Balance (in shares)	1,006,986	1,082,895
Exercisable (in shares)	1,006,986
Exercisable, weighted average remaining contractual life (Year)	4 years 4 months 24 days
Minimum [Member]
Balance, warrant exercise price (in dollars per share)	$ 9.6
Expired warrants (in dollars per share)	99
Balance, warrant exercise price (in dollars per share)	9.6	$ 9.6
Exercisable, warrant exercise price (in dollars per share)	9.6
Maximum [Member]
Balance, warrant exercise price (in dollars per share)	157.5
Expired warrants (in dollars per share)	99
Balance, warrant exercise price (in dollars per share)	94.5	157.5
Exercisable, warrant exercise price (in dollars per share)	94.5
Weighted Average [Member]
Balance, warrant exercise price (in dollars per share)	24.32
Expired warrants (in dollars per share)	99
Balance, warrant exercise price (in dollars per share)	0	$ 24.32
Exercisable, warrant exercise price (in dollars per share)	$ 15.31