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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.

X

- Definition

Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life.

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