Note 12 - Related Party Transactions (Details Textual)			12 Months Ended
	Feb. 12, 2025 USD ($) $ / shares shares	Oct. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2023 $ / shares	Dec. 31, 2022	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			326,560
Revolving Credit Facility [Member]
Line of Credit Facility, Commitment Fee Amount | $			$ 4,000	$ 51,000
Chief Executive Officer [Member]
Operating Lease, Expense | $			76,000	78,000
Lessee, Operating Lease, Renewal Term						2 years
Accrued Rent | $			$ 0	$ 30,000
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
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] | 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] | Series B-1 Preferred Stock [Member] | CEO, Secretary, Directors, Velan, Stonepine, Nantahala, and Rubric [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] | Series B-1 Preferred Stock [Member] | Chief Executive Officer [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] | Series B-1 Preferred Stock [Member] | Beneficial Owner [Member]
Stock Issued During Period, Shares, New Issues	734
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] | Common Stock [Member] | CEO, Secretary, Directors, Velan, Stonepine, Nantahala, and Rubric [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] | Common Stock [Member] | Patrick Marshall [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] | Common Stock [Member] | Carlo Sistilli [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] | Common Stock [Member] | Beneficial Owner [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
Equity Offering, Maximum Amount | $		$ 5,000,000
October 2024 SPA [Member] | Series A-1 Preferred Stock [Member] | Chief Executive Officer, Secretary, and Director [Member]
Stock Issued During Period, Shares, New Issues		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