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Note 10 - Related Party Transactions (Details Textual) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 12, 2025 USD ($) $ / shares shares | Oct. 30, 2024 USD ($) $ / shares shares | Oct. 31, 2023 USD ($) | Mar. 31, 2025 USD ($) $ / shares | Dec. 31, 2024 USD ($) | Mar. 31, 2024 USD ($) $ / shares | Dec. 31, 2023 USD ($) | Mar. 31, 2025 USD ($) $ / shares shares | Mar. 31, 2024 USD ($) $ / shares | Sep. 30, 2024 $ / shares | Sep. 30, 2023 $ / shares
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  | $ 15.35 |  | $ 21.76 |  | $ 15.35 | $ 21.76 | $ 21.74 | $ 19.51
Class of Warrant or Right, Issued During Period |  |  |  |  |  |  |  | 326,560 |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  | Base Rate [Member] |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Pardeep Nijhawan Medicine Professional Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ |  |  | $ 10,000,000 |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 3.00% |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Percentage of Borrowing Base for Outstanding Principal |  |  | 85.00% |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Amount | $ |  |  |  | $ 0 |  | $ 4,000 |  | $ 13,000 | $ 25,000 |  |
Unsecured Line of Credit [Member] | Pardeep Nijhawan Medicine Professional Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ |  |  | $ 3,500,000 |  |  |  |  |  |  |  |
Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Lease, Expense | $ |  |  |  | $ 0 | $ 18,000 | $ 20,000 | $ 40,000 |  |  |  |
Chief Executive Officer, Secretary, and Director [Member] | Warrant Shares [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  | $ 3.445 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period |  | 326,560 |  |  |  |  |  |  |  |  |
February 2025 Series B-1 Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ | $ 15,000,000 |  |  |  |  |  |  | 15,000,000 |  |  |
February 2025 Series B-1 Purchase Agreement [Member] | Series B-1 Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 834 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Ratio | 5,208 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price | $ / shares | $ 1.92 |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares | $ 10,000 |  |  |  |  |  |  |  |  |  |
February 2025 Series B-1 Purchase Agreement [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 3,468,746 |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares | $ 1.92 |  |  |  |  |  |  |  |  |  |
February 2025 Series B-1 Purchase Agreement [Member] | CEO, Secretary, Directors, Velan, Stonepine, Nantahala, and Rubric [Member] | Series B-1 Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 834 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Ratio | 5,208 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price | $ / shares | $ 1.92 |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares | $ 10,000 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Maximum Beneficial Ownership | 4.99% |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Maximum Beneficial Ownership at Option of Holder | 9.99% |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Maximum Beneficial Ownership at Option of Holder Given 61 Days Notice | 19.99% |  |  |  |  |  |  |  |  |  |
February 2025 Series B-1 Purchase Agreement [Member] | CEO, Secretary, Directors, Velan, Stonepine, Nantahala, and Rubric [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 3,468,746 |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares | $ 1.92 |  |  |  |  |  |  |  |  |  |
February 2025 Series B-1 Purchase Agreement [Member] | Chief Executive Officer [Member] | Series B-1 Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 100 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ | $ 1,000,000 |  |  |  |  |  |  |  |  |  |
February 2025 Series B-1 Purchase Agreement [Member] | Patrick Marshall [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 41,666 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ | $ 80,000 |  |  |  |  |  |  |  |  |  |
February 2025 Series B-1 Purchase Agreement [Member] | Carlo Sistilli [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 10,416 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ | $ 20,000 |  |  |  |  |  |  |  |  |  |
February 2025 Series B-1 Purchase Agreement [Member] | Beneficial Owner [Member] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ | $ 12,500,000 |  |  |  |  |  |  |  |  |  |
February 2025 Series B-1 Purchase Agreement [Member] | Beneficial Owner [Member] | Series B-1 Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 734 |  |  |  |  |  |  |  |  |  |
February 2025 Series B-1 Purchase Agreement [Member] | Beneficial Owner [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 2,687,500 |  |  |  |  |  |  |  |  |  |
October 2024 SPA [Member] | Chief Executive Officer, Secretary, and Director [Member] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ |  | $ 1,540,819 |  |  |  |  |  | $ 1,500,000 |  |  |
Equity Offering, Maximum Amount | $ |  | $ 5,000,000 |  |  |  |  |  |  |  |  |
October 2024 SPA [Member] | Chief Executive Officer, Secretary, and Director [Member] | Series A-1 Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 150 |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Ratio |  | 2,903 |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price | $ / shares |  | $ 3.445 |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Maximum Beneficial Ownership |  | 19.99% |  |  |  |  |  |  |  |  |
Equity Offering, Maximum Amount | $ |  | $ 5,000,000 |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Shares Issuable |  | 435,414 |  |  |  |  |  |  |  |  |

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