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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 |  |  |  |  |  |  |  |  |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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