Note 11 - Equity Offerings - Schedule of Warrants or Rights (Details) - $ / shares		3 Months Ended
		Mar. 31, 2025	Oct. 25, 2024	Sep. 03, 2024
Outstanding, Warrants (in shares)		19,635,513
Issued, Warrants (in shares)		0
Exercised, Warrants (in shares)		(939,000)
Expired, Warrants (in shares)		(578,900)
Outstanding, Warrants (in shares)		18,117,613
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)
May 2020 Warrants [Member]
Outstanding, Warrants (in shares)		1,275
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 5,625
Expiration Date, Warrants		May 20, 2025
May 2020 Placement Agent Warrants [Member]
Outstanding, Warrants (in shares)		124
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 7,031.25
Expiration Date, Warrants		May 20, 2025
August 2020 Warrants [Member]
Outstanding, Warrants (in shares)		1,943
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 4,375
Expiration Date, Warrants		Aug. 03, 2025
August 2020 Placement Agent Warrants [Member]
Outstanding, Warrants (in shares)		192
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 5,468.75
Expiration Date, Warrants		Jul. 30, 2925
August 2021 Pharos Banker Warrants [Member]
Outstanding, Warrants (in shares)		148
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 1,495
Expiration Date, Warrants		Aug. 16, 2026
February 2022 Series B Warrants [Member]
Outstanding, Warrants (in shares)		39,153
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 140
Expiration Date, Warrants		Feb. 04, 2029
July 2022 Series C Warrants [Member]
Outstanding, Warrants (in shares)		28,402
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 140
Expiration Date, Warrants		Jul. 22, 2027
September 2024 Prepaid Series H Warrants [Member]
Outstanding, Warrants (in shares)	[1]	657,000
September 2024 Series I Warrants [Member]
Outstanding, Warrants (in shares)		1,078,900
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 0.7
Expiration Date, Warrants		Mar. 03, 2026
September 2024 Prepaid Series I Warrants [Member]
Outstanding, Warrants (in shares)	[1]	1,500,000
September 2024 Series J Warrants [Member]
Outstanding, Warrants (in shares)		3,578,901
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 1
Expiration Date, Warrants		Sep. 03, 2029
September 2024 Representative Warrants [Member]
Outstanding, Warrants (in shares)		214,734
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 1.55		$ 1.55
Expiration Date, Warrants		Aug. 29, 2029
October 2024 Series K Warrants [Member]
Outstanding, Warrants (in shares)		10,695,962
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 0.7
Expiration Date, Warrants		Jul. 13, 2030
October 2024 Placement Warrants [Member]
Outstanding, Warrants (in shares)		320,879
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 1.09	$ 1.085
Expiration Date, Warrants		Apr. 25, 2030

[1] In calculating net loss per share, the Abeyance Shares were included in the weighted-average number of common shares and excluded from the anti-dilutive number of warrants excluded from the net loss per share calculation (see Note 12, Net Loss Per Share).