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Note 1 - Summary of Significant Accounting Policies - Finite Lived Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Gross carrying amount | $ 10,860 | $ 10,407
Accumulated amortization | 4,768 | 4,030
Intangible Assets, Net | $ 6,092 | $ 6,376
Customer Relationships [Member] |  |
Useful life (Year) | 15 years | 15 years
Gross carrying amount | $ 4,894 | $ 4,833
Accumulated amortization | 1,582 | 1,273
Intangible Assets, Net | $ 3,312 | $ 3,559
Finite-Lived Intangible Asset, Useful Life | 15 years | 15 years
Certification Marks [Member] |  |
Useful life (Year) | 8 years | 8 years
Gross carrying amount | $ 584 | $ 584
Accumulated amortization | 267 | 133
Intangible Assets, Net | $ 317 | $ 451
Finite-Lived Intangible Asset, Useful Life | 8 years | 8 years
Trademarks [Member] |  |
Gross carrying amount | $ 1,333 | $ 1,306
Accumulated amortization | 700 | 586
Intangible Assets, Net | $ 633 | $ 720
Trademarks [Member] | Minimum [Member] |  |
Useful life (Year) | 8 years | 8 years
Finite-Lived Intangible Asset, Useful Life | 8 years | 8 years
Trademarks [Member] | Maximum [Member] |  |
Useful life (Year) | 10 years | 10 years
Finite-Lived Intangible Asset, Useful Life | 10 years | 10 years
Patents [Member] |  |
Useful life (Year) | 20 years | 20 years
Gross carrying amount | $ 1,119 | $ 931
Accumulated amortization | 165 | 118
Intangible Assets, Net | $ 954 | $ 813
Finite-Lived Intangible Asset, Useful Life | 20 years | 20 years
Patents [Member] | Maximum [Member] |  |
Useful life (Year) | 20 years |
Finite-Lived Intangible Asset, Useful Life | 20 years |
Developed Technology Rights [Member] |  |
Useful life (Year) | 10 years | 10 years
Gross carrying amount | $ 311 | $ 295
Accumulated amortization | 22 | 5
Intangible Assets, Net | $ 289 | $ 290
Finite-Lived Intangible Asset, Useful Life | 10 years | 10 years
Other Intangible Assets [Member] |  |
Useful life (Year) | 5 years | 5 years
Gross carrying amount | $ 6 | $ 6
Accumulated amortization | 6 | 6
Intangible Assets, Net | $ 0 | $ 0
Finite-Lived Intangible Asset, Useful Life | 5 years | 5 years
Computer Software, Intangible Asset [Member] |  |
Gross carrying amount | $ 2,613 | $ 2,452
Accumulated amortization | 2,026 | 1,909
Intangible Assets, Net | $ 587 | $ 543
Computer Software, Intangible Asset [Member] | Minimum [Member] |  |
Useful life (Year) | 1 year | 1 year
Finite-Lived Intangible Asset, Useful Life | 1 year | 1 year
Computer Software, Intangible Asset [Member] | Maximum [Member] |  |
Useful life (Year) | 3 years | 3 years
Finite-Lived Intangible Asset, Useful Life | 3 years | 3 years

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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