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Summary of Significant Accounting Policies - Fair Value (Details) - USD ($)	6 Months Ended
	Mar. 31, 2020	Sep. 30, 2019
Warranty
Length of warranty period	24 months
Self-Insurance Reserves
Estimated liability for medical claims incurred but not reported	$ 48,567	$ 55,700
Excess of funded premiums over estimated claims incurred but not reported	200,895	123,100
Fair value on a recurring basis | Quoted Price in Active Markets for Identical Assets (Level 1) | Money market funds
Assets
Cash and cash equivalents	$ 21,578,153	$ 21,450,242

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Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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