Note 6 - Income Taxes - Components of Deferred Tax Accounts Recognized for Financial Purposes (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Deferred tax assets:
Net operating loss and other carryforwards	$ 15,189	$ 16,893
Common stock options	1,038	1,003
Unearned revenue	271	343
Interest expense limitation	29	10
Lease liability	442	575
Other	310	330
Total deferred tax assets	17,279	19,154
Deferred tax liabilities:
ROU - Asset	(431)	(570)
Other	(252)	(321)
Total deferred tax liabilities	(683)	(891)
Net deferred tax asset	16,596	18,263
Valuation allowance	(16,321)	(18,215)
Net deferred tax asset	275	48
Other Noncurrent Assets [Member]
Deferred tax liabilities:
Net deferred tax asset	$ 275	$ 48