Summary of Significant Accounting Policies - Fair Value, Warranty and Self-Insurance Reserves (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Warranty
Standard Product Warranty Accrual, Length of Warranty Period	24 months
Self-Insurance Reserves
Estimated liability for medical claims incurred but not reported	$ 55,900	$ 48,200
Excess of funded premiums over estimated claims incurred but not reported	208,700
Fair Value, Measurements, Recurring | Quoted Price in Active Markets for Identical Assets (Level 1) | Money Market Funds
Assets
Cash and cash equivalents	$ 6,051,902	$ 11,607,293