Note 9 - Stockholders' Equity - Summary of Warrants Outstanding (Details)	Sep. 30, 2024 $ / shares shares
Securities into which warrants are convertible (in shares)	140,596
First Set of Warrants Expiring April 2024 [Member]
Securities into which warrants are convertible (in shares)	29,150
Securities into which warrants are convertible (in dollars per share) | $ / shares	$ 2.5
Second Set of Warrants Expiring April 2024 [Member]
Securities into which warrants are convertible (in shares)	100,532
Securities into which warrants are convertible (in dollars per share) | $ / shares	$ 3.125
Warrants Expiring March 2025 [Member]
Securities into which warrants are convertible (in shares)	10,914
Securities into which warrants are convertible (in dollars per share) | $ / shares	$ 22.99