Note 2 - Going Concern (Details Textual) - USD ($)							1 Months Ended	3 Months Ended						5 Months Ended	9 Months Ended
	Oct. 02, 2025	Oct. 01, 2025	Sep. 30, 2025	Aug. 18, 2025	Jan. 29, 2025	Jan. 27, 2025	Nov. 12, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Jul. 29, 2024	Sep. 30, 2025	Sep. 30, 2024	Apr. 17, 2025	Jan. 28, 2025	Dec. 31, 2024	Aug. 14, 2024	Aug. 14, 2023
Net Income (Loss) Attributable to Parent								$ (5,890,000)	$ (17,581,000)	$ (5,512,000)	$ (1,623,000)	$ (7,897,000)	$ (6,528,000)		$ (28,982,000)	$ (16,048,000)
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation															(10,399,000)	(8,539,000)
Retained Earnings (Accumulated Deficit)			$ (307,256,000)					(307,256,000)							(307,256,000)				$ (278,273,000)
Cash and Cash Equivalent			7,184,000					7,184,000							7,184,000				1,443,000
Working Capital (Deficit)			(28,600,000)					(28,600,000)							(28,600,000)
Revenue from Contract with Customer, Excluding Assessed Tax								242,000			0				242,000	$ 0
Stock Issued During Period, Value, New Issues								6,213,000
Subscription Receivable, Current			$ 3,087,000					$ 3,087,000							$ 3,087,000				$ 0
Third Tranche Notes [Member]
Debt Instrument, Face Amount																		$ 5,400,000
Debt Instrument, Original Issuance Discount																		8.00%
Debt Instrument, Unamortized Discount																		$ 435,000
Debt Issuance Costs, Gross																		400,000
Long-Term Debt, Gross																		$ 5,000,000
First RD Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)					1,215,278
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)					$ 2.88
Third Tranche Notes, Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)																		862,699		862,699,000,000
Anson Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			1,870,960					1,870,960							1,870,960
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 1,870,960					$ 1,870,960							$ 1,870,960
Proceeds from Warrant Exercises			$ 3,090,000.00
Subscription Receivable, Current			$ 3,090,000.00					$ 3,090,000.00							$ 3,090,000.00
Anson Warrants [Member] | Subsequent Event [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		1,870,960
Proceeds from Warrant Exercises	$ 3,090,000.00	$ 3,090,000.00
RD Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)				3,959,999		1,215,278
Shares Issued, Price Per Share (in dollars per share)				$ 1.65		$ 2.88
Stock Issued During Period, Value, New Issues				$ 6,200,000		$ 3,255,000
Payments of Stock Issuance Costs				$ 300,000		200,000
Proceeds from Issuance or Sale of Equity					$ 3,255,000	$ 3,500,000
ATM Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)								1,350,788						385,515	1,749,866
Stock Issued During Period, Value, New Issues								$ 3,740,000	$ 1,012,000		$ 219,000	$ 1,228,000	$ 179,000		$ 4,700,000
Payments of Stock Issuance Costs								100,000							100,000
Equity Offering, Maximum Offering Amount																	$ 20,000,000				$ 4,900,000
Proceeds from Issuance or Sale of Equity								$ 3,810,000							$ 4,850,000
ATM Offering [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues (in shares)							415,097
Payments of Stock Issuance Costs							$ 30,000.00