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Supplemental Balance Sheet Disclosures - Accrued Expenses (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2022 | Sep. 30, 2021
Accrued expenses |  |  |
Warranty | $ 585,867 | $ 585,867 | $ 589,260
Salary, benefits and payroll taxes | 366,801 | 366,801 | 385,287
Professional fees | 129,584 | 129,584 | 163,130
Income taxes payable | 164,715 | 164,715 | 104,737
Operating lease | 13,951 | 13,951 | 14,296
Other | 297,243 | 297,243 | 174,405
Total accrued expenses | 1,558,161 | 1,558,161 | $ 1,431,115
Warranty cost and accrual information |  |  |
Warranty accrual, beginning of period | 596,436 | 589,260 |
Accrued expense | 32,054 | 64,644 |
Warranty cost | (42,623) | (68,037) |
Warranty accrual, end of period | $ 585,867 | $ 585,867 |

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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6911-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6935-107765 + Details
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