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Supplemental Balance Sheet Disclosures - Property and Equipment & Other Assets (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) aircraft | Dec. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Property and equipment |  |  |  |
Property and equipment, gross | $ 21,399,764 |  | $ 21,337,082 |
Less: accumulated depreciation and amortization | (13,268,315) |  | (13,193,599) |
Property and equipment, net | 8,131,449 |  | 8,143,483 |
Depreciation and amortization for property and equipment | 92,372 | $ 93,051 |  |
Other assets |  |  |  |
Intangible assets, net of accumulated amortization of $634,032 at September 30, 2021 and $583,655 at September 30, 2020 | 62,474 |  | 62,474 |
Operating lease right-of-use asset | 39,336 |  | 42,976 |
Other non-current assets | 79,845 |  | 82,834 |
Total other assets | 181,655 |  | 188,284 |
Accumulated amortization of intangible assets | 634,032 |  | 634,032 |
Impairment charges | 0 | 0 |  |
Intangible asset amortization expense | 0 | 19,914 |  |
Prepaid software licenses | 4,545 |  |  | $ 7,535
Computer equipment |  |  |  |
Property and equipment |  |  |  |
Property and equipment, gross | 2,294,387 |  | 2,309,053 |
Corporate airplanes |  |  |  |
Property and equipment |  |  |  |
Property and equipment, gross | $ 5,601,039 |  | 5,601,039 |
Number of airplanes depreciated | aircraft | 2 |  |  |
Pilatus Aircraft Limited |  |  |  |
Property and equipment |  |  |  |
Number of airplanes depreciated | aircraft | 1 |  |  |
Furniture and office equipment |  |  |  |
Property and equipment |  |  |  |
Property and equipment, gross | $ 970,725 |  | 970,725 |
Manufacturing facility |  |  |  |
Property and equipment |  |  |  |
Property and equipment, gross | 5,889,491 |  | 5,889,491 |
Equipment |  |  |  |
Property and equipment |  |  |  |
Property and equipment, gross | 5,622,877 |  | 5,545,529 |
Land |  |  |  |
Property and equipment |  |  |  |
Property and equipment, gross | 1,021,245 |  | $ 1,021,245 |
Prepaid software licenses |  |  |  |
Other assets |  |  |  |
Intangible asset amortization expense | $ 2,990 | $ 717 |  |

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