Note 4 - Warrants and Equity (Details Textual) - USD ($)					1 Months Ended					2 Months Ended	3 Months Ended						6 Months Ended		9 Months Ended
	Nov. 13, 2025	Oct. 01, 2025	Sep. 30, 2025	Jan. 31, 2025	Aug. 31, 2025	Jul. 31, 2025	Jun. 30, 2025	Feb. 28, 2025	Aug. 31, 2024	Sep. 30, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2024	Aug. 18, 2025	Dec. 31, 2024	Oct. 31, 2024	Dec. 26, 2023
Stock Issued During Period, Value, Warrant Exercises											$ 3,000	$ 6,000	$ 4,000	$ 0	$ 1,000
Common Stock, Shares Authorized (in shares)			500,000,000							500,000,000	500,000,000								500,000,000			500,000,000	500,000,000
Loss On Issuance of Warrant Liabilities											$ (20,609,000)	(10,352,000)	0	0	0	$ 0	$ (10,352,000)	$ 0	$ (30,962,000)	$ 0
Warrant Liabilities, Transaction Costs											$ 530,000	$ 1,207,000	$ (0)	$ (0)	$ (0)	$ (0)	$ 1,207,000	$ (0)	$ 1,737,000	$ (0)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)						19,889
Consultant [Member]
Stock Issued During Period, Shares, Issued for Services (in shares)						58,785
Common Stock in 2025 Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)							9,972,026	1,150,000
Securities Purchase Agreement 2025 [Member]
Equity Issued, Purchase Price Per Share (in dollars per share)							$ 0.37	$ 1.07				$ 0.37					$ 0.37
Proceeds from Issuance or Sale of Equity							$ 7,500,000	$ 3,500,000
Securities Purchase Agreement 2025 [Member] | Maximum [Member]
Proceeds from Issuance or Sale of Equity							$ 10,300,000
Securities Purchase Agreement 2025 and Warrant Inducement Offer Letter [Member]
Proceeds from Issuance or Sale of Equity								$ 9,300,000
Common Stock in 2024 Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)									283,000
Securities Purchase Agreement 2024 [Member]
Equity Issued, Purchase Price Per Share (in dollars per share)									$ 2.23
The 2025 ATM Agreement [Member]
At Market Issuance Sales Agreement, Maximum Aggregate Offering Price						$ 6,500,000
At Market Issuance Sales Agreement, Commission Fee, Percentage of Gross Proceeds						3.00%
The 2025 ATM Agreement [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues (in shares)	736,549
Inducement Warrants In 2025 Warrant Inducement Offer Letter [Member]
Stock Issued During Period, Shares, Inducement Warrants Exercised (in shares)					16,216,216
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)					$ 0.37			$ 1
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								5,828,570
Series F Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 0.55		$ 0.55					$ 0.55	$ 0.55								$ 0.55
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)					64,864,864
Proceeds from Issuance of Warrants					$ 6,000,000
Series F Warrants [Member] | Subsequent Event [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.4349
Series E Warrants in 2025 Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							48,240,000					48,240,000					48,240,000
Proceeds from Issuance of Warrants										$ 1,100,000
Stock Issued During Period, Value, Warrant Exercises										$ 2,996,192
Warrants and Rights Outstanding							$ 16,300,000					$ 16,300,000					$ 16,300,000
Series E Warrants in 2025 Agreement [Member] | Subsequent Event [Member]
Class of Warrant or Right, Exercised During Period (in shares)		1,175,351
Class of Warrant or Right, Exercised During Period, Exercise Price (in dollars per share)		$ 0.37
Pre-funded Warrants in 2025 Agreement [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)							$ 0.001	$ 0.001				$ 0.001					$ 0.001
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							6,107,974	2,121,029				6,107,974					6,107,974
Common Warrants in 2025 Agreement [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)							$ 0.37					$ 0.37					$ 0.37
Class of Warrant or Right, Floor Price (in dollars per share)							$ 0.12					$ 0.12					$ 0.12
Warrants and Rights Outstanding, Term (Year)								5 years
Securities Purchase Agreement 2025 [Member]
Loss On Issuance of Warrant Liabilities							$ 10,400,000
Warrant Liabilities, Transaction Costs							$ 1,200,000
Series D Warrants in 2025 Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								6,543,058
Series C Warrants In 2025 Warrant Inducement Offer Letter [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)								$ 0.75
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								11,657,140
Proceeds from Issuance or Sale of Equity								$ 5,800,000
Warrants and Rights Outstanding, Term (Year)								5 years
Pre-funded Warrants in 2024 Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)									2,183,368
Series A Warrants in 2024 Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)									2,466,368
Series B Warrants in 2024 Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)									2,466,368
Common Warrants Issued In Connection With The 2023 Securities Purchase Agreement[Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)																								$ 2.23	$ 9.6
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)																								895,834
Warrants and Rights Outstanding, Term (Year)																								5 years
Equity Classified Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 0.43							$ 0.43	$ 0.43					$ 9.15			$ 0.43		$ 9.15
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			375,000							375,000	375,000					3,334			375,000		3,334
Warrants and Rights Outstanding, Term (Year)			10 years							10 years	10 years					10 years			10 years		10 years
Class of Warrant or Right, Exercised During Period (in shares)																			7,477,570
Class of Warrant or Right, Vesting Period (Year)			4 years																		4 years
Class of Warrant or Right, Issued During Period (in shares)																			19,966,089
Class of Warrant or Right, Outstanding (in shares)			20,230,882							20,230,882	20,230,882								20,230,882				7,810,033
Equity Classified Warrants [Member] | Vesting Based On Performance Criteria [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				50,000
Equity Classified Warrants [Member] | Vesting Over 4 Year Term [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				50,000
Class of Warrant or Right, Vesting Period (Year)				4 years
Equity Classified Warrants [Member] | Consultant 1 [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 1.64
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				50,000
Warrants and Rights Outstanding, Term (Year)				10 years
Equity Classified Warrants [Member] | Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 0.55							$ 0.55	$ 0.55								$ 0.55				$ 0
Class of Warrant or Right, Exercised During Period, Exercise Price (in dollars per share)																			$ 2.23
Warrants [Member] | Consultant [Member]
Class of Warrant or Right, Issued During Period (in shares)						200,000
Warrants [Member] | Consultant [Member] | Vesting Immediately [Member]
Class of Warrant or Right, Issued During Period (in shares)						100,000
Warrants [Member] | Consultant [Member] | Vesting Upon Signing of Letter of Intent or Closing of a 10 Million Deal [Member]
Class of Warrant or Right, Issued During Period (in shares)						100,000
Value of Licensing Deal						$ 10,000,000
Pre-funded Warrants [Member]
Class of Warrant or Right, Outstanding (in shares)			0							0	0		2,025						0