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Note 4 - Acquisitions - Estimated Fair Value and Estimated Useful Lives of Identifiable Intangible Assets Acquired (Details) - Genasys Acquisition [Member] - USD ($) |  | 6 Months Ended
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Jan. 18, 2018 | Jun. 30, 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 |

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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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- Details
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- Details
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- Details
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