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v3.20.2

Note 2 - Basis of Presentation and Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Number of Wholly Owned Subsidiaries | 5 |  |
Number of Additional Inactive Subsidiaries | 2 |  |
Investments, Typical Final Maturity Maximum (Year) | 3 years |  |
Investments, Typical Portfolio Weighted Average Maturity (Month) | 1 year 180 days |  |
Cash and Cash Equivalents, at Carrying Value, Ending Balance | $ 23,319 | $ 18,819 |
Restricted Cash and Cash Equivalents, Total | 677 | 698 |
Deferred Revenue for Collection Issues | 0 | 0 |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | 130 | 127 |
Inventory Obsolescence Write Down (Recoveries) | (37) | (134) |
Cost of Revenue, Total | 20,371 | 18,523 |
Revenue from Contract with Customer, Including Assessed Tax | 43,010 | 36,979 |
Advertising Expense | 263 | 157 |
Standard and Extended Product Warranty Accrual, Ending Balance | 126 | 150 | $ 99
Impairment of Intangible Assets, Finite-lived | $ 0 | 0 |
Number of Reportable Segments | 2 |  |
Number of Operating Segments | 2 |  |
Foreign Currency Transaction Gain (Loss), before Tax, Total | $ 213 |  |
Shipping and Handling [Member] |  |  |
Cost of Revenue, Total | 259 | 278 |
Revenue from Contract with Customer, Including Assessed Tax | $ 241 | $ 279 |
Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 2 years |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 3 years |  |
Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 7 years |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 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 | 36.00% | 33.00% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer 2 [Member] |  |  |
Concentration Risk, Percentage | 24.00% | 11.00% |

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