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Note 5 - Fair Value Measurements - Fair Value by Categories of Long-lived Assets (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Intangible assets, impairment loss |  | $ (11,133) |  |
Patents [Member] |  |  |  |
Intangible assets, impairment loss |  | (11,133) |  | 0
Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Intangible assets, impairment loss |  |  |  | 0
Goodwill from Genasys acquisition(b) | [1] |  |  |
Fair Value, Measurements, Nonrecurring [Member] | Intangible Assets from Genasys Acquisition [Member] |  |  |  |
Intangible assets, impairment loss | [2] |  |  |
Fair Value, Measurements, Nonrecurring [Member] | Patents [Member] |  |  |  |
Intangible assets, impairment loss |  | (11,133) | [3] |
Reported Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Goodwill from Genasys acquisition(b) | [1] | 2,445,990 |  |
Reported Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Intangible Assets from Genasys Acquisition [Member] |  |  |  |
Intangible assets, fair value | [2] | 1,520,006 |  |
Reported Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Patents [Member] |  |  |  |
Intangible assets, fair value |  | 37,340 | [3] | 55,689
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Goodwill from Genasys acquisition(b) | [1] |  |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Goodwill from Genasys acquisition(b) | [1] |  |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Goodwill from Genasys acquisition(b) | [1] | 2,445,990 |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Intangible Assets from Genasys Acquisition [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Intangible assets, fair value | [2] |  |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Intangible Assets from Genasys Acquisition [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Intangible assets, fair value | [2] |  |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Intangible Assets from Genasys Acquisition [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Intangible assets, fair value | [2] | 1,520,006 |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Patents [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Intangible assets, fair value |  |  | [3] |
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Patents [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Intangible assets, fair value |  |  | [3] |
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Patents [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Intangible assets, fair value |  | $ 37,340 | [3] | $ 55,689
[1] | Represents acquired goodwill from the acquisition of Genasys. There was no impairment related to these assets. (See Note 4, Acquisition and Note 8, Goodwill and Intangible Assets, for more information)
[2] | Represents acquired intangible assets from the acquisition of Genasys. There was no impairment related to these assets. (See Note 4, Acquisition and Note 8, Goodwill and Intangible Assets, for more information)
[3] | During the year ended September 30, 2018, the Company determined that certain patents were impaired. The impaired patents related to products no longer sold by the Company.

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- Definition Fair value portion of asset representing the future economic benefits arising 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 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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