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Note 5 - Fair Value Measurements - Fair Value by Categories of Long-lived Assets (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Intangible assets, impairment loss |  | $ (11,133) |
Goodwill, impairment loss | 0 |  |
Intangible Assets from Genasys Acquisition [Member] |  |  |
Intangible assets, impairment loss |  | 0 |
Patents [Member] |  |  |
Intangible assets, impairment loss | 0 | (11,133) |
Fair Value, Nonrecurring [Member] |  |  |
Intangible assets, impairment loss | 0 |  |
Goodwill, impairment loss |  |  | [1]
Fair Value, Nonrecurring [Member] | Intangible Assets from Genasys Acquisition [Member] |  |  |
Intangible assets, impairment loss |  |  | [2]
Fair Value, Nonrecurring [Member] | Patents [Member] |  |  |
Intangible assets, impairment loss |  | (11,133) | [3]
Reported Value Measurement [Member] | Fair Value, Nonrecurring [Member] |  |  |
Goodwill, fair value | 2,305,750 | 2,445,990 | [1]
Reported Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Intangible Assets from Genasys Acquisition [Member] |  |  |
Intangible assets, fair value | 1,142,814 | 1,520,006 | [2]
Reported Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Patents [Member] |  |  |
Intangible assets, fair value | 32,820 | 37,340 | [3]
Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Goodwill, fair value |  |  | [1]
Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Goodwill, fair value |  |  | [1]
Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Goodwill, fair value | 2,305,750 | 2,445,990 | [1]
Estimate of Fair Value Measurement [Member] | Fair Value, 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, 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, Nonrecurring [Member] | Intangible Assets from Genasys Acquisition [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Intangible assets, fair value | 1,142,814 | 1,520,006 | [2]
Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Patents [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Intangible assets, fair value |  |  | [3]
Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Patents [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Intangible assets, fair value |  |  | [3]
Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Patents [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Intangible assets, fair value | $ 32,820 | $ 37,340 | [3]
[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.
[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 assets, excluding financial assets, that lack physical substance, having a limited useful life. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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