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Summary of Significant Accounting Policies - Fair Value (Details) - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Warranty
Length of warranty period	24 months
Self-Insurance Reserves
Estimated liability for medical claims incurred but not reported	$ 60,200	$ 53,200
Excess of funded premiums over estimated claims incurred but not reported	102,000
Fair value on a recurring basis | Quoted Price in Active Markets for Identical Assets (Level 1) | Money market funds
Assets
Cash and cash equivalents	$ 19,725,474	$ 23,897,092

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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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://www.xbrl.org/2003/role/presentationRef
-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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