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

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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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).

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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