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Note 1 - Summary of Significant Accounting Policies - Finite Lived Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Gross carrying amount | $ 12,173 | $ 10,860
Accumulated amortization | 5,830 | 4,768
Intangible Assets, Net | $ 6,343 | $ 6,092
Customer Relationships [Member] |  |
Useful life (Year) | 15 years | 15 years
Gross carrying amount | $ 4,856 | $ 4,894
Accumulated amortization | 1,815 | 1,582
Intangible Assets, Net | $ 3,041 | $ 3,312
Certification Marks [Member] |  |
Useful life (Year) | 8 years | 8 years
Gross carrying amount | $ 1,068 | $ 584
Accumulated amortization | 884 | 267
Intangible Assets, Net | 184 | 317
Trademarks [Member] |  |
Gross carrying amount | 532 | 633
Accumulated amortization | 1,120 | 1,333
Intangible Assets, Net | $ 588 | $ 700
Trademarks [Member] | Minimum [Member] |  |
Useful life (Year) | 8 years | 8 years
Trademarks [Member] | Maximum [Member] |  |
Useful life (Year) | 10 years | 10 years
Patents [Member] |  |
Useful life (Year) | 20 years | 20 years
Gross carrying amount | $ 1,302 | $ 1,119
Accumulated amortization | 219 | 165
Intangible Assets, Net | $ 1,083 | $ 954
Developed Technology Rights [Member] |  |
Useful life (Year) | 10 years | 10 years
Gross carrying amount | $ 346 | $ 311
Accumulated amortization | 75 | 22
Intangible Assets, Net | $ 271 | $ 289
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
Computer Software, Intangible Asset [Member] |  |
Gross carrying amount | 1,232 | 587
Accumulated amortization | 3,475 | 2,613
Intangible Assets, Net | $ 2,243 | $ 2,026
Computer Software, Intangible Asset [Member] | Minimum [Member] |  |
Useful life (Year) | 1 year | 1 year
Computer Software, Intangible Asset [Member] | Maximum [Member] |  |
Useful life (Year) | 3 years | 3 years

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 10 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480265/350-10-S45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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