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Note 2 - Basis of Presentation and Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Number of Wholly Owned Subsidiaries	5
Number of Additional Inactive Subsidiaries	2
Investments, Typical Final Maturity Maximum (Year)	3 years
Investments, Typical Portfolio Weighted Average Maturity (Month)	1 year 180 days
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 23,319	$ 18,819
Restricted Cash and Cash Equivalents, Total	677	698
Deferred Revenue for Collection Issues	0	0
Accounts Receivable, Allowance for Credit Loss, Ending Balance	130	127
Inventory Obsolescence Write Down (Recoveries)	(37)	(134)
Cost of Revenue, Total	20,371	18,523
Revenue from Contract with Customer, Including Assessed Tax	43,010	36,979
Advertising Expense	263	157
Standard and Extended Product Warranty Accrual, Ending Balance	126	150	$ 99
Impairment of Intangible Assets, Finite-lived	$ 0	0
Number of Reportable Segments	2
Number of Operating Segments	2
Foreign Currency Transaction Gain (Loss), before Tax, Total	$ 213
Shipping and Handling [Member]
Cost of Revenue, Total	259	278
Revenue from Contract with Customer, Including Assessed Tax	$ 241	$ 279
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	2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer 1 [Member]
Concentration Risk, Percentage	36.00%	33.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer 2 [Member]
Concentration Risk, Percentage	24.00%	11.00%

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