Note 11 -Stockholders' Equity - Warrant Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Balance (in shares)	340,689	14,518
Balance, exercise price (in dollars per share)	$ 19.4	$ 313.71
Warrants, weighted average remaining contract term (Year)	4 years 6 months 25 days	3 months 21 days	1 year 5 months 8 days
Warrants granted (in shares)	1,071,429	326,171
Warrants granted, weighted average exercise price (in dollars per share)		$ 6.3
Warrants exercised (in shares)	(158,731)
Exercisable (in shares)		14,518
Exercisable, exercise price (in dollars per share)		$ 313.71
Exercisable, weighted average remaining contract term (Year)		5 months 8 days
Warrants exercised (in shares)	(14,518)
Warrants expired/canceled (in shares)	(1,071,429)	(326,171)
Balance (in shares)	1,238,869	340,689	14,518
Balance, exercise price (in dollars per share)	$ 3.14	$ 19.4	$ 313.71
Pre-funded Warrant [Member]
Warrants granted (in shares)	(946,429)	64,286
Warrants granted, weighted average exercise price (in dollars per share)		$ 0.045
Warrants exercised (in shares)	(946,429)	(64,286)
Warrants exercised, weighted average exercise price (in dollars per share)		$ 0.045
Warrants expired/canceled (in shares)	946,429	(64,286)