Note 15 - Income Taxes - Reconciliation of Actual Income Tax Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Expense (benefit) for U.S. federal income tax at statutory rate	$ 2,639	$ (4,763)
Expense (benefit) for U.S. federal income tax at statutory rate, percentage	21.00%	21.00%
Research and experimentation tax credit	$ (480)	$ 6
Research and experimentation tax credit, percentage	(3.90%)	(0.10%)
State income taxes, net of federal income tax benefit	$ 302	$ (265)
State income taxes, net of federal income tax benefit, percentage	2.50%	1.20%
Nondeductible goodwill	$ 0	$ 911
Nondeductible goodwill, percentage	0.00%	(4.00%)
Change in valuation allowance	$ (2,459)	$ 3,768
Change in valuation allowance, percentage	(19.60%)	(16.60%)
Change in fair value of contingent consideration	$ 0	$ (278)
Change in fair value of contingent consideration, percentage	0.00%	1.20%
Disallowed stock compensation	$ 171	$ 217
Disallowed stock compensation, percentage	1.40%	(1.00%)
Impact due to foreign currency translation	$ 51	$ 460
Impact due to foreign currency translation, percentage	0.40%	(2.00%)
Other items	$ 139	$ 117
Other items, percentage	1.10%	(0.50%)
Income Tax Expense (Benefit)	$ 363	$ 173
Total tax expense and effective tax rate, percentage	2.90%	(0.80%)