Note 2 - Basis of Presentation and Significant Accounting Policies (Details Textual)	12 Months Ended
Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Number of Wholly Owned Subsidiaries	3
Number of Additional Inactive Subsidiaries	2
Investments, Typical Final Maturity Maximum	3 years
Investments, Typical Portfolio Weighted Average Maturity	1 year 180 days
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 18,819,078	$ 11,063,091
Restricted Cash and Cash Equivalents, Total	697,840	742,983
Deferred Revenue for Collection Issues	0	0
Accounts Receivable, Allowance for Credit Loss, Ending Balance	126,593	150,000
Inventory Obsolescence Write Down (Recoveries)	(133,532)	21,481
Cost of Revenue, Total	18,522,548	13,567,076
Revenue from Contract with Customer, Including Assessed Tax	36,979,055	26,306,790
Advertising Expense	21,417	28,092
Standard and Extended Product Warranty Accrual, Ending Balance	150,229	99,216	$ 104,518
Impairment of Intangible Assets, Finite-lived		11,133
Number of Reportable Segments	2
Number of Operating Segments	2
Foreign Currency Transaction Loss, before Tax	$ 233,718
Patents [Member]
Impairment of Intangible Assets, Finite-lived	0	11,133
Shipping and Handling [Member]
Cost of Revenue, Total	277,721	291,994
Revenue from Contract with Customer, Including Assessed Tax	$ 277,888	$ 169,184
Minimum [Member]
Property, Plant and Equipment, Useful Life	2 years
Finite-Lived Intangible Asset, Useful Life	3 years
Maximum [Member]
Property, Plant and Equipment, Useful Life	7 years
Finite-Lived Intangible Asset, Useful Life	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	33.00%	12.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer 2 [Member]
Concentration Risk, Percentage	11.00%	11.00%

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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