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v3.22.1

Summary of Significant Accounting Policies (Details) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2022 USD ($) segment | Mar. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Number of business segments |  |  |  |  |  |  |
Number of business segments in which the entity operates | segment |  |  |  | 1 |  |  |
Long-Lived Assets |  |  |  |  |  |  |
Impairment charges | $ 0 | $ 0 |  | $ 0 | $ 0 |  |
Contract Balances |  |  |  |  |  |  |
Balance at beginning of the period (contract liabilities) |  |  |  | 417,504 |  |  |
Amount transferred to receivables from contract assets |  |  |  | 0 |  |  |
Contract asset additions |  |  |  | 0 |  |  |
Performance obligations satisfied during the period that were included in the contract liability balance at the beginning of the period |  |  |  | (316,320) |  |  |
Increases due to invoicing prior to satisfaction of performance obligations |  |  |  | 175,544 |  |  |
Balance at end of the period (contract liabilities) | 276,728 |  |  | 276,728 |  |  |
Customer Service Revenue |  |  |  |  |  |  |
Customer Service Cost of Sales | 2,663,210 | 2,218,854 |  | 5,391,267 | 4,522,683 |  |
Gross profit | 4,182,610 | 2,902,991 |  | $ 8,150,331 | 5,468,814 |  |
Engineering Development |  |  |  |  |  |  |
Percentage of employees who were engineers engaged in various engineering development projects |  |  |  | 19.00% |  |  |
Warranty |  |  |  |  |  |  |
Length of warranty period |  |  |  | 24 months |  |  |
Self-Insurance Reserves |  |  |  |  |  |  |
Estimated liability for medical claims incurred but not reported | 59,859 |  |  | $ 59,859 |  | $ 55,934 |
Excess of funded premiums over estimated claims incurred but not reported | 233,567 |  |  | 233,567 |  | 208,651 |
Restricted Cash |  |  |  |  |  |  |
Dividends paid |  |  | $ 8,607,192 |  |  |  |
Cash and cash equivalents | 11,618,840 |  |  | 11,618,840 |  | 8,265,606 |
Total cash and cash equivalents and restricted cash | 11,618,840 | 5,997,691 |  | 11,618,840 | 5,997,691 | $ 8,265,606 | $ 23,784,867
Customer Service |  |  |  |  |  |  |
Customer Service Revenue |  |  |  |  |  |  |
Customer Service Sales | 1,360,155 | 1,214,372 |  | 2,445,600 | 2,029,875 |  |
Customer Service Cost of Sales | 399,086 | 354,664 |  | 742,736 | 671,301 |  |
Gross profit | $ 961,069 | $ 859,708 |  | $ 1,702,864 | $ 1,358,574 |  |
Property Plant and Equipment Other than Air Transportation Equipment and Manufacturing Facility | Minimum |  |  |  |  |  |  |
Number of business segments |  |  |  |  |  |  |
Estimated useful lives |  |  |  | 3 years |  |  |
Property Plant and Equipment Other than Air Transportation Equipment and Manufacturing Facility | Maximum |  |  |  |  |  |  |
Number of business segments |  |  |  |  |  |  |
Estimated useful lives |  |  |  | 7 years |  |  |
Manufacturing facility |  |  |  |  |  |  |
Number of business segments |  |  |  |  |  |  |
Estimated useful lives |  |  |  | 39 years |  |  |
Corporate airplanes |  |  |  |  |  |  |
Number of business segments |  |  |  |  |  |  |
Estimated useful lives |  |  |  | 10 years |  |  |

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