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Note 1 - Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended
--- | ---
Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) shares
Depreciation, Total | $ 1,699,311 | $ 1,944,186
Number of Reportable Segments | 1 |
Goodwill, Impairment Loss | $ 0 | 0
Number of Patents Granted | 30 |
Amortization of Intangible Assets, Total | $ 602,492 | 477,568
Impairment, Long-Lived Asset, Held-for-Use, Total | 0 | 0
Unrecognized Tax Benefits, Ending Balance | 0 | 0
Research and Development Expense, Total | 1,243,499 | 1,269,542
Advertising Expense | $ 436,253 | $ 296,571
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares | 0 | 337,100
Patents [Member] |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 20 years | 20 years
Patents [Member] | Maximum [Member] |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 20 years |

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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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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 730 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6472174&loc=d3e58812-109433 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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