Note 11 - Equity Offerings - Issuance of Warrants (Details) - $ / shares	Mar. 31, 2025	Dec. 31, 2024
Number of shares (in shares)	18,117,613	19,635,513
Exercise price (in dollars per share)
Placement Agent Warrant 1 [Member]
Number of shares (in shares)	3,300
Exercise price (in dollars per share)	$ 312.5
Expiration (Year)	5 years
Placement Agent Warrant 2 [Member]
Number of shares (in shares)	3,100
Exercise price (in dollars per share)	$ 175
Expiration (Year)	5 years