Note 9 - Related-party Transactions (Details Textual) - USD ($)		12 Months Ended
	Jul. 27, 2021	Sep. 30, 2022	Sep. 30, 2021
Stock Issued During Period, Shares, New Issues (in shares)	945,946
Shares Issued, Price Per Share (in dollars per share)	$ 3.70
Stock Issued During Period, Value, New Issues	$ 3,500,000	$ 4,016,000	$ 3,517,000
Board of Directors Chairman [Member]
Stock Issued During Period, Shares, New Issues (in shares)	337,838
Stock Issued During Period, Value, New Issues	$ 1,250,000
Percentage of Common Stock		37.00%
Board of Directors Chairman [Member] | Minimum [Member]
Percentage of Common Stock		5.00%
Warrant Agreements Associated with July 2021 Stock Issuance [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	141,892
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 5.50
Warrant Agreements Associated with July 2021 Stock Issuance [Member] | Board of Directors Chairman [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	50,676
Warrant to Purchase Common Stock [Member] | Board of Directors Chairman [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		232,558
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 2.50
Incurred Fees [Member] | Law Firm Whose Partner is a Director and Stockholder [Member]
Related Party Transaction, Expenses from Transactions with Related Party		$ 109,000	121,000
Accrued Liability for Unbilled Services [Member] | Law Firm Whose Partner is a Director and Stockholder [Member]
Due to Related Parties, Current, Total		$ 25,000	$ 16,000