Note 6 - Income Taxes - Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Income tax expense (benefit) at statutory rate	$ 649	$ (39)
State income tax expense	9	148
Foreign rate differential	(31)	0
Foreign tax activity	0	97
PPP loan forgiveness	(488)	0
Permanent differences, net	67	538
Expiration of net operating losses	3,945	3,666
Change in valuation allowance	(4,255)	(4,298)
Return to provision true-up	166	0
Other	(47)	36
Provision for income taxes	$ 15	$ 148