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Note 6 - Capital Shares (Details Textual) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 12, 2025 USD ($) $ / shares shares | Oct. 30, 2024 USD ($) $ / shares Rate shares | May 01, 2025 shares | Mar. 31, 2025 USD ($) $ / shares shares | Mar. 31, 2024 USD ($) $ / shares shares | Dec. 31, 2023 | Mar. 31, 2025 USD ($) $ / shares shares | Mar. 31, 2024 USD ($) $ / shares shares | Oct. 31, 2024 USD ($) | 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 |  |  |  |
Stock Issued During Period, Value, New Issues | $ |  |  |  | $ 6,870,373 | $ 275,765 |  | $ 7,497,133 | $ 590,966 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term |  |  |  |  |  |  |  | 5 years |  |  |
Class of Warrant or Right, Outstanding, Weighted Average Remaining Contractual Term |  |  |  |  |  |  | 34 months |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  |  |  | 500 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  |  |  |  |  |  | 74 months |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares |  |  |  | $ 24.66 |  |  | $ 24.66 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Per Share | $ / shares |  |  |  | $ 0 |  |  | $ 0 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  |  |  |  |  |  | 72 months |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares |  |  |  | 33,354 |  |  | 33,354 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Option, Nonvested, Weighted Average Exercise Price | $ / shares |  |  |  | $ 7.12 |  |  | $ 7.12 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Intrinsic Value Per Share | $ / shares |  |  |  | $ 0 |  |  | $ 0 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Weighted Average Remaining Contractual Term |  |  |  |  |  |  | 98 months |  |  |  |
Share-Based Payment Arrangement, Nonemployee [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross |  |  |  | 0 | 0 |  | 0 | 0 |  |  |
Share-Based Payment Arrangement, Employee [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross |  |  |  | 0 | 500 |  | 0 | 500 |  |  |
The 2019 Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized |  |  |  | 642,737 |  |  | 642,737 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant |  |  |  | 85,329 |  |  | 85,329 |  |  |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term |  |  |  |  |  |  | 5 years |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period |  |  |  |  |  | 10 years | 10 years |  |  |  |
Share-Based Payment Arrangement, Expense | $ |  |  |  | $ 100,000 | $ 100,000 |  | $ 100,000 | $ 300,000 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ |  |  |  | 100,000 |  |  | $ 100,000 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  | 18 months |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period |  |  |  |  |  |  | 10 years |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ |  |  |  | $ 0 |  |  | $ 0 |  |  |  |
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 |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term |  | 5 years |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Maximum Beneficial Ownership | Rate |  | 19.99% |  |  |  |  |  |  |  |  |
H.C. Wainwright & Co., LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  | 304,057 |  |  |  |
Equity Offering, Maximum Amount | $ |  |  |  |  |  |  |  |  | $ 3,870,000 |  |
Stock Issued During Period, Value, New Issues | $ |  |  |  |  |  |  | $ 800,000 |  |  |  |
Payments of Stock Issuance Costs | $ |  |  |  |  |  |  | 25,000,000,000 |  |  |  |
H.C. Wainwright & Co., LLC [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 0 |  |  |  |  |  |  |  |
February 2025 Series B-1 Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ | $ 15,000,000 |  |  |  |  |  | 15,000,000 |  |  |  |
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 |  |  |  |  |  |  |  |  |
Units Issued, Percentage of Underlying Conversion Shares |  | 75.00% |  |  |  |  |  |  |  |  |
Units Issued, Combined Purchase Price | $ / shares |  | $ 10,272.13 |  |  |  |  |  |  |  |  |
Equity Offering, Maximum Without Approval | $ |  | $ 0.02 |  |  |  |  |  |  |  |  |
Series B-1 Preferred Stock [Member] | February 2025 Series B-1 Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 834 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share | $ / shares | $ 10,000 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Ratio | 5,208 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price | $ / shares | $ 1.92 |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares | $ 10,000 |  |  |  |  |  |  |  |  |  |
Common Stock [Member] | February 2025 Series B-1 Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 3,468,746 |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares | $ 1.92 |  |  |  |  |  |  |  |  |  |
Series A-1 Preferred Stock [Member] | October 2024 SPA [Member] | Chief Executive Officer, Secretary, and Director [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 150 |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share | $ / shares |  | $ 10,000 |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Ratio |  | 2,903 |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price | $ / shares |  | $ 3.445 |  |  |  |  |  |  |  |  |
Equity Offering, Maximum Amount | $ |  | $ 5,000,000 |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Shares Issuable |  | 435,414 |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Maximum Beneficial Ownership |  | 19.99% |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 10.00% |  |  |  |  |  |  |  |  |

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