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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

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X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 45
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- Definition

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+ References

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X

- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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