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Note 4 - Acquisitions - Estimated Fair Value and Estimated Useful Lives of Identifiable Intangible Assets Acquired (Details) - Genasys Acquisition [Member] - USD ($)		3 Months Ended
	Jan. 18, 2018	Mar. 31, 2018
Intangible assets acquired, fair value	$ 1,850,000
Intangible assets acquired, useful lives (Year)		6 years
Technology-Based Intangible Assets [Member]
Intangible assets acquired, fair value	$ 690,000
Intangible assets acquired, useful lives (Year)	7 years
Customer Relationships [Member]
Intangible assets acquired, fair value	$ 660,000
Intangible assets acquired, useful lives (Year)	7 years
Trade Names [Member]
Intangible assets acquired, fair value	$ 240,000
Intangible assets acquired, useful lives (Year)	5 years
Noncompete Agreements [Member]
Intangible assets acquired, fair value	$ 260,000
Intangible assets acquired, useful lives (Year)	3 years

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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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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