Note 7 - Capital Shares (Details Textual)				12 Months Ended
	Feb. 12, 2025 USD ($) $ / shares shares	Oct. 30, 2024 USD ($) $ / shares shares	Oct. 04, 2024 USD ($) shares	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 $ / shares	Aug. 31, 2022 USD ($)
Equity Offering, Maximum Amount | $							$ 150,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares				$ 15.35	$ 21.74	$ 19.51
Class of Warrant or Right, Issued During Period | shares				326,560
Stock Issued During Period, Value, New Issues | $				$ 7,717,634	$ 729,387
Class of Warrant or Right, Outstanding, Weighted Average Remaining Contractual Term				28 months
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period | shares				0	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value | $				$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term				68 months
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares				$ 25.59
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Per Share | $ / shares				$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				67 months
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares | shares				17,880
Share-Based Compensation Arrangement by Share-Based Payment Award, Option, Nonvested, Weighted Average Exercise Price | $ / shares				$ 6.77
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Intrinsic Value Per Share | $ / shares				$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Weighted Average Remaining Contractual Term				91 months
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $				$ 10,000.00
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				12 months
Share-Based Payment Arrangement, Expense | $				$ 700,000	$ 500,000
The 2019 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized | shares				2,367,737
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant | shares				693,515
Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term				5 years	5 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period				10 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate				0.00%	0.00%
Share-Based Payment Arrangement, Option [Member] | The 2019 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period				10 years
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 | $				$ 1,800,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				32 months
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 | shares		326,560
Warrants and Rights Outstanding, Term		5 years
Class of Warrant or Right, Maximum Beneficial Ownership		19.99%
February 2025 Series B-1 Purchase Agreement [Member]
Proceeds from Issuance or Sale of Equity | $	$ 15,000,000
February 2025 Series B-1 Purchase Agreement [Member] | Series B-1 Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues | shares	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
February 2025 Series B-1 Purchase Agreement [Member] | Common Stock [Member]
Stock Issued During Period, Shares, New Issues | shares	3,468,746
Shares Issued, Price Per Share | $ / shares	$ 1.92
October 2024 SPA [Member] | Chief Executive Officer, Secretary, and Director [Member]
Proceeds from Issuance or Sale of Equity | $		$ 1,540,819
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 | $		$ 2,000,000
October 2024 SPA [Member] | Series A-1 Preferred Stock [Member] | Chief Executive Officer, Secretary, and Director [Member]
Stock Issued During Period, Shares, New Issues | shares		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 | shares		435,414
Preferred Stock, Convertible, Maximum Beneficial Ownership		19.99%
Preferred Stock, Dividend Rate, Percentage		10.00%
At The Market Offering Agreement [Member]
Stock Issued During Period, Shares, New Issues | shares			1,177,568
Equity Offering, Maximum Amount | $			$ 3,870,000
Stock Issued During Period, Value, New Issues | $			$ 3,400,000