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Note 4 - Acquisition - Estimated Fair Value and Estimated Useful Lives of Identifiable Intangible Assets Acquired (Details) - Genasys Acquisition [Member] | Jan. 18, 2018 USD ($)
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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

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- 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. + Details
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- 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 + Details
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- Details
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- Details
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