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Note 2 - Basis of Presentation and Significant Accounting Policies (Details Textual) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Oct. 01, 2018 USD ($) | Sep. 30, 2016 USD ($)
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 |  | 18 years |  |
Restricted Cash and Cash Equivalents, Total | $ 742,983 | $ 39,446 |  |
Deferred Revenue for Collection Issues | 0 | 0 |  |
Allowance for Doubtful Accounts Receivable, Ending Balance | 150,000 | 0 |  |
Inventory Obsolescence Write Down (Recoveries) | 21,481 | 161,600 |  |
Capital Lease Obligations, Total | $ 0 | 0 |  |
Product Warranty Period | 1 year |  |  |
Cost of Revenue, Total | $ 13,567,076 | 10,035,577 |  |
Revenues, Total | 26,306,790 | 20,314,178 |  |
Advertising Expense | 28,092 | 42,232 |  |
Standard and Extended Product Warranty Accrual, Ending Balance | $ 99,216 | 104,518 |  | $ 243,423
Number of Reportable Segments | 2 |  |  |
Foreign Currency Transaction Loss, before Tax | $ 236,430 |  |  |
Shipping and Handling [Member] |  |  |  |
Cost of Revenue, Total | 291,994 | 148,862 |  |
Revenues, Total | $ 169,184 | $ 124,141 |  |
Accounting Standards Update 2014-09 [Member] | Subsequent Event [Member] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 0 |
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] | Customer 1 [Member] | Accounts Receivable [Member] |  |  |  |
Concentration Risk, Percentage | 12.00% | 31.00% |  |
Customer Concentration Risk [Member] | Customer 2 [Member] | Accounts Receivable [Member] |  |  |  |
Concentration Risk, Percentage | 11.00% | 22.00% |  |
Customer Concentration Risk [Member] | Customer 3 [Member] | Accounts Receivable [Member] |  |  |  |
Concentration Risk, Percentage |  | 14.00% |  |

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