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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
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: |