Note 9 - Warrants - Summary of Outstanding Common Stock Purchase Warrants (Details)	Dec. 31, 2024 $ / shares shares
Exercisable, warrants (in shares) | shares	47,878
Exercisable, warrant, weighted average exercise price (in dollars per share) | $ / shares	$ 37.75
Warrants Expiring September 2023 [Member]
Exercisable, warrants (in shares) | shares	822
Exercisable, warrant, weighted average exercise price (in dollars per share) | $ / shares	$ 56.25
Warrants Expiring May 2024 [Member]
Exercisable, warrants (in shares) | shares	3,357
Exercisable, warrant, weighted average exercise price (in dollars per share) | $ / shares	$ 168.3
Warrants Expiring October 2024 [Member]
Exercisable, warrants (in shares) | shares	3,199
Exercisable, warrant, weighted average exercise price (in dollars per share) | $ / shares	$ 168.75
Warrants Expiring January 2025 [Member]
Exercisable, warrants (in shares) | shares	40,500
Exercisable, warrant, weighted average exercise price (in dollars per share) | $ / shares	$ 2.52