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Note 8 - Notes Payable and Convertible Notes Payable (Details Textual)					1 Months Ended								2 Months Ended		3 Months Ended				4 Months Ended	9 Months Ended
	Oct. 31, 2024 USD ($)	Sep. 30, 2024 USD ($) $ / shares shares	Apr. 30, 2019 USD ($)	Feb. 28, 2019 USD ($)	Dec. 31, 2024 USD ($)	Nov. 30, 2024 USD ($)	Oct. 31, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($) $ / shares	May 31, 2022 USD ($)	Sep. 30, 2021 USD ($)	May 31, 2021 USD ($) $ / shares shares	Feb. 28, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($) $ / shares shares	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) shares	Sep. 30, 2023 USD ($)	Apr. 30, 2025 USD ($)	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 USD ($)
Proceeds from Notes Payable, Total																				$ 0	$ 350,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) \| shares		5,271,604													5,271,604		5,271,604			5,271,604
Fair Value Adjustment of Warrants															$ (697,000)			$ (6,341,000)		$ (956,000)	(5,958,000)
New Avenue Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) \| shares																	150,000
Convertible Notes Payable [Member]
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		$ 41,000													$ 41,000		$ 174,000			$ 41,000
Avenue [Member] \| Warrants Issued with 2021 Avenue Loan [Member]
Warrants and Rights Outstanding												$ 1,500,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) \| shares												150,000
Avenue [Member] \| New Avenue Warrant [Member]
Warrants and Rights Outstanding												$ 700,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares		$ 4.6014										$ 16			$ 4.6014					$ 4.6014
Fair Value Adjustment of Warrants															$ 100,000
Avenue [Member] \| Minimum [Member] \| Public Equity Offering [Member]
Equity Milestone 1 Condition for Extended Interest Only Period								$ 35,000,000
The 2019 MD Loan [Member] \| Department of Housing and Community Development [Member]
Debt Instrument, Face Amount				$ 500,000
Debt Instrument, Interest Rate, Stated Percentage				8.00%
Debt Instrument, Convertible, Number of Equity Instruments				5,995
Interest Expense, Debt															10,000			10,000		$ 30,000	30,000
The 2019 Cecil Loan [Member] \| Advance Cecil Inc. [Member]
Debt Instrument, Face Amount			$ 100,000
Debt Instrument, Interest Rate, Stated Percentage			8.00%
Debt Instrument, Convertible, Number of Equity Instruments			1,199
Interest Expense, Debt															2,000			2,000		6,000	6,000
The 2022 MD Loan [Member] \| Department of Housing and Community Development [Member]
Debt Instrument, Face Amount										$ 3,000,000
Debt Instrument, Interest Rate, Stated Percentage										6.00%
Interest Expense, Debt															15,000			15,000		46,000	43,000
Proceeds from Loans																$ 1,000,000
Debt Instrument, Monthly Interest-only Payments, Maximum Amount, First Eighteen Installments										$ 15,000
Debt Instrument, Monthly Principal and Interest Payment, for the Next Thirty Installments										33,306
Interest Payable		$ 50,000													$ 50,000		50,000			$ 50,000
Debt Issuance Costs, Gross										$ 31,000
The 2022 DHCD Loan [Member] \| Convertible Notes Payable [Member]
Debt Instrument, Interest Rate, Stated Percentage		6.00%													6.00%					6.00%
The 2022 DHCD Loan [Member] \| Department of Housing and Community Development [Member]
Debt Instrument, Face Amount									$ 5,000,000
Debt Instrument, Interest Rate, Stated Percentage									6.00%
Interest Expense, Debt															$ 100,000			100,000		$ 200,000	200,000
Interest Payable		$ 300,000													300,000		$ 300,000			300,000
Debt Issuance Costs, Gross									$ 100,000
Debt Instrument, Convertible, Minimum Increment of Principal for Exercise									$ 1,000,000
Debt Conversion, Conversion Price, Percent of 30-day Trailing Volume-weighted Average Sale Price of Common Stock									97.00%
Debt Instrument, Convertible, Conversion Price (in dollars per share) \| $ / shares									$ 80
Coupon Interest Expense															100,000			100,000		200,000	200,000
Amortization of Debt Issuance Costs and Discounts															$ 3,000			1,000		$ 8,000	(1,000)
Debt Instrument, Interest Rate, Effective Percentage		5.99%													5.99%		5.91%			5.99%
The 2021 Avenue Loan [Member] \| Avenue [Member]
Debt Instrument, Face Amount												$ 30,000,000
Debt Instrument, Interest Rate, Stated Percentage												3.25%
Interest Expense, Debt															$ 800,000			1,100,000		$ 3,100,000	3,000,000
Debt Instrument, Basis Spread on Variable Rate												6.60%
Debt Instrument, Interest Rate During Period																15.10%	14.10%
Debt Issuance Costs, Net												$ 800,000
Debt Issuance Costs Expensed												$ 47,000
Debt Instrument, Interest Only Payments, Period (Month)												12 months
Debt Instrument, First Interest-only Period Extension (Month)												12 months
Debt Instrument, Periodic Payment, Principal	$ 3,300,000	$ 3,300,000													3,300,000
Additional Payment at Debt Maturity, Percentage of Principal												4.25%
Additional Payment at Debt Maturity												$ 900,000
Debt Instrument, Convertible, Maximum Conversion Amount																$ 5,000,000
Debt Instrument, Covenant, Cash and Certain Cash Equivalents, Minimum		$ 5,000,000													5,000,000					5,000,000
The 2021 Avenue Loan [Member] \| Avenue [Member] \| Convertible Notes Payable [Member]
Interest Expense, Debt																		300,000		400,000	800,000
Coupon Interest Expense																		$ 200,000		300,000	600,000
Amortization of Debt Issuance Costs and Discounts															$ 100,000					$ 100,000	$ 200,000
Debt Instrument, Interest Rate During Period															22.79%					17.52%	22.79%
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net																	$ 100,000
The 2021 Avenue Loan [Member] \| Avenue [Member] \| Forecast [Member]
Debt Instrument, Periodic Payment, Principal					$ 500,000	$ 500,000							$ 500,000						$ 1,800,000
Debt Instrument, Covenant, Minimum Gross Proceeds from Equity Securities Required														$ 10,000,000
The 2021 Avenue Loan [Member] \| Avenue [Member] \| Subsequent Event [Member]
Debt Instrument, Periodic Payment, Principal							$ 2,000,000
The 2021 Avenue Loan [Member] \| Avenue [Member] \| Notes Payable, Tranche 1 [Member]
Proceeds from Notes Payable, Total											$ 5,000,000	15,000,000
The 2021 Avenue Loan [Member] \| Avenue [Member] \| Notes Payable, Tranche 2 [Member]
Debt Instrument, Unfunded Balance												$ 10,000,000