Note 10 - Common Stock Warrants and Warrant Liabilities (Details Textual) - USD ($)			1 Months Ended	3 Months Ended				9 Months Ended
	Jun. 15, 2026	Aug. 19, 2025	Mar. 31, 2025	Sep. 30, 2026		Mar. 31, 2026	Sep. 30, 2025	Sep. 30, 2026		Sep. 30, 2025	Jun. 12, 2026	Jan. 16, 2026	Dec. 31, 2025		Oct. 31, 2025	Oct. 16, 2025	Oct. 15, 2025	Sep. 27, 2024	Jul. 29, 2024	Nov. 01, 2022
Proceeds from Warrant Exercises				$ 0			$ 200,000	$ 292,000		$ 851,000
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 0.06				$ 0.06
Fair Value Adjustment of Warrants				$ (0)			$ (0)	$ (5,846,899,000)		(0)
Class Of Warrant Or Right, Number Of Securities, Withholding (in shares)	49,440
Class of Warrant or Right, Outstanding				167,545,749,000				167,545,749,000					1,098,239,000
Payments for Repurchase of Warrants		$ 525,000						$ (0)		$ 1,989,000
Common Stock [Member]
Stock Issued During Period, Shares, Warrants Exercised	22,614,600
R01 [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	11,307,300
Class Of Warrant Or Right, Number Of Securities, Withholding (in shares)	24,720
Framework [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	11,307,300
Class Of Warrant Or Right, Number Of Securities, Withholding (in shares)	24,720
October 2025 Pre-Funded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				22,664,040				22,664,040			22,664,040				22,664,040
Class of Warrant or Right, Exercise Price of Warrants or Rights															$ 0.002385	$ 5.5	$ 0.05
Class of Warrant or Right, Outstanding				0	[1]			0	[1]		1,081,082		1,081,082,000	[1]
Maximum Percentage of Common Stock Outstanding																9.90%
The January 2026 Warrants [Member]
Class of Warrant or Right, Per Share Price of Warrants of Rights												$ 0.85
Class of Warrant or Right, Purchase Price of Warrants or Rights												0.8
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 0.05				$ 0.05				$ 0.05
Fair Value Adjustment of Warrants						$ 5,300,000,000
Class of Warrant or Right, Outstanding				167,539,227,000				167,539,227,000					0
The July 2024 Series F-1 and F-3 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights																		$ 3.3	$ 5.5
Payments for Repurchase of Warrants			$ 2,000,000
Series F-1 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			254,545
Maximum Percentage of Common Stock Outstanding																			4.99%
Series F-1 Warrants [Member] | Election of the holder prior to the date of issuance [Member]
Maximum Percentage of Common Stock Outstanding																			9.99%
Series F-3 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			148,988
The November 2022 A-1 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 1,102.5				$ 1,102.5												$ 1,102.5
Class of Warrant or Right, Outstanding				454,000				454,000					454,000

[1] exercisable for an aggregate of 22,664,040 shares of Common Stock