Note 6 - Income Taxes - Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Income tax expense (benefit) at statutory rate	$ (1,537)	$ 649
State income tax expense	14	9
Foreign rate differential	(593)	(31)
PPP loan forgiveness	0	(488)
Permanent differences, net	425	67
Expiration of net operating losses	3,129	3,945
Change in valuation allowance	(1,894)	(4,255)
Return to provision true-up	(13)	166
Other	234	(47)
Provision for income taxes	$ (235)	$ 15