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Note 4 - Acquisition - Summary of Pro Forma Adjustments (Details) - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Pro forma adjustments, net income	$ 43,398	$ (156,453)
Acquisition-related Costs [Member]
Pro forma adjustments, net income	371,331	41,016
Depreciation and Amortization Costs [Member]
Pro forma adjustments, net income	(316,396)	(292,078)
Tax Effect of Adjustments [Member]
Pro forma adjustments, net income	$ (11,537)	$ 94,609

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

- Details

Name:	us-gaap_NonrecurringAdjustmentAxis=us-gaap_AcquisitionRelatedCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_NonrecurringAdjustmentAxis=lrad_DepreciationAndAmortizationCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_NonrecurringAdjustmentAxis=lrad_TaxEffectOfAdjustmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: