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Note 7 - Intangible Assets | 12 Months Ended
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Sep. 30, 2017
Notes to Financial Statements |
Intangible Assets Disclosure [Text Block] | 7 . INTANGIBLE ASSETS Intangible assets related to patents and trademarks consisted of the following:
|  | September 30, |
|  | 2017 |  |  | 2016 |
Cost |  | $ | 108,247 |  |  | $ | 108,247 |
Accumulated amortization |  |  | (52,558 | ) |  |  | (45,342 | )
Intangible assets, net |  | $ | 55,689 |  |  | $ | 62,905 |
|  | Year ended September 30, |
|  | 2017 |  |  | 2016 |
Amortization expense |  | $ | 7,216 |  |  | $ | 6,752 |
Estimated Amortization Expense Years Ended September 30, |  |  |  |
2018 |  | $ | 6,535 |
2019 |  |  | 6,247 |
2020 |  |  | 5,924 |
2021 |  |  | 5,636 |
2022 |  |  | 5,506 |
Thereafter |  |  | 25,841 |
Total estimated amortization expense |  | $ | 55,689 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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