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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: |