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Note 8 - Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | December 31, |  |  | September 30, |
|  | 2019 |  |  | 2019 |
Technology |  | $ | 626,587 |  |  | $ | 611,043 |
Customer relationships |  |  | 599,344 |  |  |  | 584,477 |
Trade name portfolio |  |  | 217,943 |  |  |  | 212,537 |
Non-compete agreements |  |  | 236,105 |  |  |  | 230,248 |
Patents |  |  | 72,126 |  |  |  | 72,126 |
|  |  | 1,752,105 |  |  |  | 1,710,431 |
Accumulated amortization |  |  | (622,823 | ) |  |  | (534,797 | )
|  | $ | 1,129,282 |  |  | $ | 1,175,634 |
|  | Three months ended December 31, |
|  | 2019 |  |  | 2018 |
Amortization expense |  | $ | 74,562 |  |  | $ | 76,807 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Fiscal year ending September 30: |  |  |  |
2020 (remaining nine months) |  | $ | 226,197 |
2021 |  |  | 245,581 |
2022 |  |  | 222,498 |
2023 |  |  | 191,342 |
2024 |  |  | 178,078 |
Thereafter |  |  | 65,586 |
Total estimated amortization expense |  | $ | 1,129,282 |

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