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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: