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Note 4 - Acquisitions - Reconciliation of Actual Net Revenue and Net Income to Pro Forma Net Revenue and Net Income (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Pro Forma adjustments, net income | $ 54,851 | $ (101,369) | $ 90,414 | $ (101,369)
Genasys Acquisition [Member] |  |  |  |
LRAD actual results, net revenues | 7,453,794 | 5,742,391 | 15,082,361 | 8,683,726
LRAD actual results, net income | 384,516 | 298,350 | (1,298,736) | (514,329)
Genasys actual results, net revenues | 589,085 | 291,857 | 1,140,533 | 790,701
Genasys actual results, net income | 89,727 | 79,067 | 126,844 | (172,740)
Pro Forma adjustments, net revenues |  |  |  |
Pro Forma adjustments, net income | 54,851 | (101,369) | 90,414 | (101,369)
Pro forma results, net revenues | 8,042,879 | 6,034,248 | 16,222,894 | 9,474,427
Pro forma results, net income | $ 529,094 | $ 276,048 | $ (1,081,478) | $ (788,438)

X
- Definition This element represents the amount of adjustments to reconcile actual net income (loss) to pro forma net income (loss) related to a business combination. + References No definition available. + Details
Name: | lrad_BusinessCombinationProFormaInformationAdjustmentsNetIncomeLoss
Namespace Prefix: | lrad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the amount of adjustments to reconcile actual revenue to pro forma revenue related to a business combination. + References No definition available. + Details
Name: | lrad_BusinessCombinationProFormaInformationAdjustmentsRevenue
Namespace Prefix: | lrad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the amount of net income (loss) of the acquiree for the reporting period, which may or may not be included in the consolidated income statement for the reporting period depending on when the acquisition occurred. + References No definition available. + Details
Name: | lrad_BusinessCombinationProFormaInformationNetIncomeLossOfAcquireeActual
Namespace Prefix: | lrad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the amount of net income (loss) of the acquiror for the reporting period, which may or may not be included in the consolidated income statement for the reporting period depending on when the acquisition occurred. + References No definition available. + Details
Name: | lrad_BusinessCombinationProFormaInformationNetIncomeLossOfAcquirorActual
Namespace Prefix: | lrad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the amount of revenue of the acquiree for the reporting period, which may or may not be included in the consolidated income statement for the reporting period depending on when the acquisition occurred. + References No definition available. + Details
Name: | lrad_BusinessCombinationProFormaInformationRevenueOfAcquireeActual
Namespace Prefix: | lrad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the amount of revenue of the acquiror for the reporting period, which may or may not be included in the consolidated income statement for the reporting period depending on when the acquisition occurred. + References No definition available. + Details
Name: | lrad_BusinessCombinationProFormaInformationRevenueOfAcquirorActual
Namespace Prefix: | lrad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessAcquisitionsProFormaRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=lrad_GenasysAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |