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Intangible assets - Intangible assets other than goodwill (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Finite-Lived Intangible Assets, Net |  |  |
Gross Carrying Value | $ 29,154,838 | $ 17,136,506 |
Accumulated Impairment | (44,400) | (44,400) |
Accumulated Amortization | (2,098,146) | (906,785) |
Total | $ 27,012,292 | 16,185,321 |
Estimated weighted average life | 5 years 9 months 18 days |  |
Intangible asset amortization expense | $ 1,191,361 | 270,627 | $ 2,126
Intangible Assets, Net (Excluding Goodwill) |  |  |
Accumulated Impairment | (44,400) | (44,400) |
Accumulated Amortization | (2,098,146) | (906,785) |
Net Carrying Value | 27,012,292 | 16,185,321 |
Customer relationships |  |  |
Finite-Lived Intangible Assets, Net |  |  |
Gross Carrying Value | 13,008,332 | 10,740,000 |
Accumulated Amortization | (1,459,861) | (268,500) |
Total | $ 11,548,471 | 10,471,500 |
Estimated weighted average life | 10 years |  |
Impairment charges | $ 0 | $ 0 |
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] | Selling, General and Administrative Expense | Selling, General and Administrative Expense |
Intangible Assets, Net (Excluding Goodwill) |  |  |
Accumulated Amortization | $ (1,459,861) | $ (268,500) |
Backlog |  |  |
Finite-Lived Intangible Assets, Net |  |  |
Gross Carrying Value | 6,310,000 |  |
Total | $ 6,310,000 |  |
Backlog | Minimum |  |  |
Finite-Lived Intangible Assets, Net |  |  |
Estimated weighted average life | 4 years |  |
Backlog | Maximum |  |  |
Finite-Lived Intangible Assets, Net |  |  |
Estimated weighted average life | 6 years |  |
Licensing and certification rights |  |  |
Finite-Lived Intangible Assets, Net |  |  |
Gross Carrying Value | $ 696,506 | 696,506 |
Accumulated Impairment | (44,400) | (44,400) |
Accumulated Amortization | (638,285) | (638,285) |
Total | 13,821 | 13,821 |
Impairment charges | 0 | 44,400 | $ 0
Intangible Assets, Net (Excluding Goodwill) |  |  |
Accumulated Impairment | (44,400) | (44,400) |
Accumulated Amortization | (638,285) | (638,285) |
Licensing and certification rights |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  |  |
Gross Carrying Value | 9,140,000 | 5,700,000 |
Net Carrying Value | $ 9,140,000 | $ 5,700,000 |
Finite-Lived Intangible Assets, Net |  |  |
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] | Selling, General and Administrative Expense | Selling, General and Administrative Expense | Selling, General and Administrative Expense
July 2024 Honeywell Asset Acquisition and the September 2024 Honeywell Agreement | Customer relationships |  |  |
Intangible Assets, Net (Excluding Goodwill) |  |  |
Intangible assets | $ 1,400,000 |  |
July 2024 Honeywell Asset Acquisition and the September 2024 Honeywell Agreement | Licensing and certification rights |  |  |
Intangible Assets, Net (Excluding Goodwill) |  |  |
Intangible assets | 3,500,000 |  |
June 2023 Honeywell Agreement | Customer relationships |  |  |
Intangible Assets, Net (Excluding Goodwill) |  |  |
Intangible assets | 900,000 |  |
June 2023 Honeywell Agreement | Licensing and certification rights |  |  |
Intangible Assets, Net (Excluding Goodwill) |  |  |
Intangible assets | 100,000 |  |
September 2024 Honeywell Agreement | Backlog |  |  |
Intangible Assets, Net (Excluding Goodwill) |  |  |
Intangible assets | $ 6,300,000 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: 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 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-2 + Details
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