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Note A - Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) shares | Sep. 30, 2017 USD ($) shares | Oct. 01, 2019 USD ($)
Depreciation, Total | $ 1,705,583 | $ 1,748,945 | $ 1,614,272 |
Number of Reportable Segments | 1 |  |  |
Goodwill, Impairment Loss | $ 0 | 0 | 0 |
Number of Patents Granted | 19 |  |  |
Amortization of Intangible Assets, Total | $ 472,827 | 298,801 | 7,822 |
Impairment of Long-Lived Assets Held-for-use | 0 | 0 | 643,604 |
Unrecognized Tax Benefits, Ending Balance | 0 | 0 |  |
Research and Development Expense, Total | 1,089,637 | 787,364 | 865,568 |
Advertising Expense | $ 278,057 | $ 365,859 | $ 378,217 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares | 268,000 | 108,000 | 0 |
Patents [Member] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 20 years | 20 years |  |
Maximum [Member] | Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  | $ 2,900,000
Maximum [Member] | Patents [Member] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 20 years |  |  |
Minimum [Member] | Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  | 2,300,000
Operating Lease, Liability, Total |  |  |  | $ 2,300,000

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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