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Note 4 - Acquisitions - Summary of Pro Forma Adjustments (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Pro forma adjustments, net income	$ 31,398	$ (49,264)	$ 47,506	$ (145,787)
Acquisition-related Costs [Member]
Pro forma adjustments, net income	119,202		315,531
Depreciation and Amortization Costs [Member]
Pro forma adjustments, net income	(79,458)	(79,458)	(238,374)	(238,374)
Tax Effect of Adjustments [Member]
Pro forma adjustments, net income	$ (8,346)	$ 30,194	$ (29,651)	$ 92,587

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

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Namespace Prefix:	lrad_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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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: