Note 2 - Basis of Presentation and Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Number of Wholly Owned Subsidiaries	8
Number of Additional Inactive Subsidiaries	2
Number Of Major Customers	2
Investments, Typical Final Maturity Maximum (Year)	3 years
Investments, Typical Portfolio Weighted Average Maturity (Month)	18 months
Cash and Cash Equivalents, at Carrying Value, Total	$ 12,736	$ 13,167
Restricted Cash, Total	923	1,361
Deferred Revenue for Collection Issues	0	0
Accounts Receivable, Allowance for Credit Loss, Ending Balance	181	127
Inventory Obsolescence Write Down (Recoveries)	(105)	(183)
Cost of Revenue, Total	27,693	23,577
Advertising Expense	677	193
Standard and Extended Product Warranty Accrual, Ending Balance	159	146	$ 126
Impairment of Intangible Assets, Finite-Lived	$ 0	0
Number of Reportable Segments	2
Foreign Currency Transaction Gain (Loss), before Tax, Total	$ (704)	260
Shipping and Handling [Member]
Cost of Revenue, Total	$ 836	$ 266
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	2 years
Finite-Lived Intangible Asset, Useful Life (Year)	3 years
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	7 years
Finite-Lived Intangible Asset, Useful Life (Year)	15 years
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number Of Major Customers	2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer 1 [Member]
Concentration Risk, Percentage	43.00%	66.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer 2 [Member]
Concentration Risk, Percentage	19.00%	18.00%