Note 16 - Income Taxes - Reconciliation of Actual Income Tax Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Expense (benefit) for U.S. federal income tax at statutory rate	$ (1,357)	$ 2,639
Expense (benefit) for U.S. federal income tax at statutory rate, percentage	21.00%	21.00%
Research and experimentation tax credit	$ (572)	$ (480)
Research and experimentation tax credit	8.80%	(3.90%)
State income taxes, net of federal income tax benefit	$ 32	$ 302
State income taxes, net of federal income tax benefit, percentage	(0.50%)	2.50%
Change in valuation allowance	$ 1,934	$ (2,459)
Change in valuation allowance, percentage	(29.90%)	(19.60%)
Foreign earnings tax	$ 125	$ 0
Foreign earnings tax, percentage	(1.90%)	0.00%
Stock compensation	$ (210)	$ 171
Stock compensation, percentage	3.20%	1.40%
Impact due to foreign currency translation	$ (44)	$ 51
Impact due to foreign currency translation	0.70%	0.40%
Other items	$ 206	$ 139
Other items, percentage	(3.20%)	1.10%
Income Tax Expense (Benefit)	$ 114	$ 363
Total tax expense and effective tax rate, percentage	(1.80%)	2.90%