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v3.21.2

Note 2 - Basis of Presentation and Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2019 USD ($)
Number of Additional Inactive Subsidiaries | 2 |  |  |
Investments, Typical Final Maturity Maximum (Year) | 3 years |  |  |
Investments, Typical Portfolio Weighted Average Maturity (Month) | 18 months |  |  |
Cash and Cash Equivalents, at Carrying Value, Ending Balance | $ 13,167 | $ 23,319 |  |
Restricted Cash and Cash Equivalents, Total | 1,361 | 677 |  |
Deferred Revenue for Collection Issues | 0 | 0 |  |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | 127 | 130 |  |
Inventory Obsolescence Write Down (Recoveries) | (183) | (37) |  |
Cost of Revenue, Total | 23,577 | 20,371 |  |
Revenue from Contract with Customer, Including Assessed Tax | 47,003 | 43,010 |  |
Advertising Expense | 193 | 263 |  |
Standard and Extended Product Warranty Accrual, Ending Balance | 146 | 126 |  | $ 150
Impairment of Intangible Assets, Finite-lived | $ 0 | $ 0 |  |
Number of Reportable Segments | 2 | 2 |  |
Number of Operating Segments |  | 2 |  |
Foreign Currency Transaction Gain (Loss), before Tax, Total | $ 260 |  |  |
Immaterial Correction of Prior Period Financial Statements [Member] |  |  |  |
Prepaid Expenses and Accrued Liabilities |  |  | $ 5,205 |
Shipping and Handling [Member] |  |  |  |
Cost of Revenue, Total | 232 | $ 259 |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 266 | $ 241 |  |
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 | 66.00% | 36.00% |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer 2 [Member] |  |  |  |
Concentration Risk, Percentage | 18.00% | 24.00% |  |

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