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Note 5 - Fair Value Measurements (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Impairment of Intangible Assets, Finite-lived |  | $ 11,133 |
Goodwill, Foreign Currency Translation Gain (Loss) | (140,240) |  |
Goodwill, Impairment Loss | 0 |  |
Genasys Acquisition [Member] |  |  |
Goodwill, Impairment Loss |  | 0 |
Intangible Assets from Genasys Acquisition [Member] |  |  |
Impairment of Intangible Assets, Finite-lived |  | 0 |
Fair Value, Nonrecurring [Member] |  |  |
Impairment of Intangible Assets, Finite-lived | 0 |  |
Goodwill, Impairment Loss |  |  | [1]
Fair Value, Nonrecurring [Member] | Intangible Assets from Genasys Acquisition [Member] |  |  |
Impairment of Intangible Assets, Finite-lived |  |  | [2]
Fair Value, Inputs, Level 3 [Member] |  |  |
Marketable Securities, Total | $ 0 | $ 0 |
[1] | Represents acquired goodwill from the acquisition of Genasys Spain. There was no impairment related to these assets. Refer to Note 8, Goodwill and Intangible Assets, for more information.
[2] | Represents acquired intangible assets from the acquisition of Genasys Spain. There was no impairment related to these assets. Refer to Note 8, Goodwill and Intangible Assets, for more information.

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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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