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Note 8 - Goodwill and Intangible Assets (Details Textual) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 18, 2018 | Sep. 30, 2018 | Jan. 18, 2018 | Sep. 30, 2017
Intangible Assets, Net (Excluding Goodwill), Total |  | $ 1,557,346 |  | $ 55,689
Goodwill, Ending Balance |  | 2,445,990 |  |
Impairment of Intangible Assets, Finite-lived |  | 11,133 |  |
Patents [Member] |  |  |  |
Impairment of Intangible Assets, Finite-lived |  | $ 11,133 |  | $ 0
Genasys [Member] |  |  |  |
Finite-lived Intangible Assets Acquired | $ 1,850,000 |  |  |
Goodwill, Acquired During Period |  |  | $ 2,603,688 |

X
- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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