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v3.19.3.a.u2

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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