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Note 2 - Basis of Presentation and Significant Accounting Policies (Details Textual)	12 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Number of Major Customers Accounted for Accounts Receivable	3	3
Investments, Typical Final Maturity Maximum	3 years
Investments, Typical Portfolio Weighted Average Maturity	1 year 180 days
Restricted Cash and Cash Equivalents	$ 39,406	$ 39,406
Deferred Revenue for Collection Issues	0	0
Allowance for Doubtful Accounts Receivable	0	0
Inventory Obsolescence Write Down (Recoveries)	$ 26,243	159,954
Finite-Lived Intangible Asset, Useful Life	15 years
Capital Lease Obligations	$ 0	0
Product Warranty Period	1 year
Shipping, Handling and Transportation Costs	$ 148,862	128,380
Shipping and Handling Revenue	124,141	78,975
Advertising Expense	42,232	66,353
Standard and Extended Product Warranty Accrual	$ 179,101	$ 356,984	$ 315,618
Number of Reportable Segments	1
Maximum [Member]
Property, Plant and Equipment, Useful Life	7 years
Minimum [Member]
Property, Plant and Equipment, Useful Life	2 years
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage	0.00%
Customer Concentration Risk [Member] | Customer 1 [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage	31.00%	27.00%
Customer Concentration Risk [Member] | Customer 2 [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage	22.00%	24.00%
Customer Concentration Risk [Member] | Customer 3 [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage	14.00%	12.00%

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