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Supplemental Balance Sheet Disclosures (Tables) | 9 Months Ended
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Jun. 30, 2021
Supplemental Balance Sheet Disclosures |
Schedule of inventories | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | September 30,
​ |  | 2021 |  | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​
Raw materials |  | $ | 4,013,201 |  | $ | 3,378,246
Work-in-process | ​ |  | 581,568 | ​ |  | 656,382
Finished goods | ​ |  | 244,042 | ​ |  | 256,707
​ |  | $ | 4,838,811 |  | $ | 4,291,335
Schedule of prepaid expenses and other current assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | September 30,
​ |  | 2021 |  | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​
Prepaid insurance |  | $ | 287,293 | ​ | $ | 336,331
Other | ​ |  | 410,036 | ​ |  | 338,778
​ |  | $ | 697,329 | ​ | $ | 675,109
Schedule of property and equipment, net | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | September 30,
​ |  | 2021 |  | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​
Computer equipment | ​ | $ | 2,310,994 | ​ | $ | 2,302,978
Corporate airplanes | ​ |  | 5,601,039 | ​ |  | 5,601,039
Furniture and office equipment | ​ |  | 970,725 | ​ |  | 1,031,099
Manufacturing facility | ​ |  | 5,883,691 | ​ |  | 5,733,313
Equipment | ​ |  | 5,557,190 | ​ |  | 5,723,355
Land | ​ | ​ | 1,021,245 | ​ | ​ | 1,021,245
​ | ​ |  | 21,344,884 | ​ |  | 21,413,029
Less: accumulated depreciation and amortization | ​ |  | (13,123,942) | ​ |  | (13,237,157)
​ |  | $ | 8,220,942 |  | $ | 8,175,872
​
Schedule of other assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | September 30,
​ |  | 2021 |  | 2020
Intangible assets, net of accumulated amortization of $632,969 and $583,655 at June 30, 2021 and September 30, 2020, respectively |  | $ | 63,537 |  | $ | 112,851
Operating lease right-of-use asset | ​ | ​ | 2,241 | ​ | ​ | 45,126
Other non-current assets | ​ | ​ | 85,586 | ​ |  | 91,566
​ |  | $ | 151,364 |  | $ | 249,543
​
Schedule of accrued expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | September 30,
​ |  | 2021 |  | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​
Warranty |  | $ | 585,247 |  | $ | 547,743
Salary, benefits and payroll taxes | ​ |  | 538,066 | ​ |  | 483,797
Professional fees | ​ |  | 151,897 | ​ |  | 151,956
Operating lease | ​ | ​ | 2,241 | ​ | ​ | 45,126
Other | ​ | ​ | 266,036 | ​ | ​ | 133,338
​ |  | $ | 1,543,487 |  | $ | 1,361,960
​
Schedule of warranty cost and accrual information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ending | ​ | Nine Months Ending
​ |  | June 30, 2021 |  | June 30, 2021
​ | ​ | ​ | ​ | ​ | ​ | ​
Warranty accrual, beginning of period |  | $ | 578,172 | ​ | $ | 547,743
Accrued expense | ​ |  | 63,874 | ​ |  | 137,740
Warranty cost | ​ |  | (56,799) | ​ |  | (100,236)
Warranty accrual, end of period |  | $ | 585,247 | ​ | $ | 585,247

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