Note 2 - Related Party Transactions (Details Textual) - USD ($)			3 Months Ended		6 Months Ended
	Jul. 27, 2021	Jul. 27, 2021	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Stock Issued During Period, Shares, New Issues (in shares)	945,946	945,946
Shares Issued, Price Per Share (in dollars per share)	$ 3.70	$ 3.70
Stock Issued During Period, Value, New Issues	$ 3,500,000
Board of Directors Chairman [Member]
Stock Issued During Period, Shares, New Issues (in shares)	337,838	337,838
Stock Issued During Period, Value, New Issues	$ 1,250,000	$ 1,250,000
Percentage of Common Stock			40.00%		40.00%
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	141,892
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 5.50	$ 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	50,676
Incurred Fees [Member] | Law Firm Whose Partner is a Director and Stockholder [Member]
Related Party Transaction, Expenses from Transactions with Related Party			$ 30,000	$ 28,000	$ 57,000	$ 60,000
Accrued Liability for Unbilled Services [Member] | Law Firm Whose Partner is a Director and Stockholder [Member]
Due to Related Parties, Current, Total			$ 18,000		$ 18,000		$ 16,000