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Note 1 - Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) shares | Oct. 01, 2019 USD ($)
Depreciation, Total | $ 1,944,186 | $ 1,705,583 |
Number of Reportable Segments | 1 |  |
Goodwill, Impairment Loss | $ 0 | 0 |
Amortization of Intangible Assets, Total | 477,568 | 472,827 |
Impairment of Long-Lived Assets Held-for-use | 0 | 0 |
Unrecognized Tax Benefits, Ending Balance | 0 | 0 |
Research and Development Expense, Total | 1,269,542 | 1,089,637 |
Advertising Expense | $ 296,571 | $ 278,057 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares | 337,100 | 108,000 |
Operating Lease, Right-of-Use Asset | $ 2,539,100 |  |
Operating Lease, Liability, Total | $ 2,794,927 |  |
Accounting Standards Update 2016-02 [Member] |  |  |
Operating Lease, Right-of-Use Asset |  |  | $ 2,400,000
Operating Lease, Liability, Total |  |  | $ 2,600,000
Patents [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 20 years | 20 years |
Maximum [Member] | Patents [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 expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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