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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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