Note 11 - Equity Offerings - Issuance of Warrants (Details) - $ / shares	Sep. 30, 2025	Dec. 31, 2024
Number of shares (in shares)	1,078,943	1,033,447
Placement Agent Warrant 1 [Member]
Number of shares (in shares)	174
Exercise price (in dollars per share)	$ 5,937.5
Expiration (Year)	5 years
Placement Agent Warrant 2 [Member]
Number of shares (in shares)	163
Exercise price (in dollars per share)	$ 3,325
Expiration (Year)	5 years