Note 2 - Related-party Transactions (Details Textual)		3 Months Ended		6 Months Ended
	Nov. 16, 2022 USD ($) $ / shares shares	Mar. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2022 USD ($)	Mar. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)
Stock Issued During Period, Value, New Issues		$ 3,000	$ 20,000	$ 1,366,000	$ 20,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 2.24		$ 2.24
Board of Directors Chairman [Member] | Warrant With Subscription Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares	511,765	562,441		562,441
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 1.02
Board of Directors Chairman [Member] | Stock With Subscription Agreement [Member]
Stock Issued During Period, Value, New Issues	$ 1,200,000
Stock Issued During Period, Shares, New Issues (in shares) | shares	1,176,471
Loan and Security Agreement [Member]
Debt Instrument, Face Amount	$ 5,500,000
Debt Instrument, Interest Rate, Stated Percentage	12.00%
Debt Instrument, Number of Equal Installment	30
Debt Instrument, Fee, Percent	2.00%
Debt Instrument, Loan Premium, Percent of Loan Amount	20.00%
Debt Instrument, Covenant, Debt Coverage Ratio	1.15
Debt Instrument, Covenant, 6-month Billings Requirement, Tranche 1	$ 12,000,000
Debt Instrument, Covenant, 6-month Billings Requirement, Tranche 2	11,000,000
Debt Instrument, Covenant, 6-month Billings Requirement, Tranche 3	12,000,000
Debt Instrument, Covenant, 6-month EBITDA Burn Requirement, Tranche 1	6,000,000
Debt Instrument, Covenant, 6-month EBITDA Burn Requirement, Tranche 2	6,500,000
Debt Instrument, Covenant, 6-month EBITDA Burn Requirement, Tranche 3	7,000,000
Security Agreement and Promissory Note [Member] | Board of Directors Chairman [Member]
Debt Instrument, Face Amount	$ 3,000,000					$ 3,000,000
Incurred Fees [Member] | Law Firm Whose Partner is a Director and Stockholder [Member]
Related Party Transaction, Amounts of Transaction		$ 10,000	$ 30,000	$ 10,000	$ 57,000
Accrued Liabilities							$ 25,000