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Note 4 - Acquisitions - Summary of Pro Forma Adjustments (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)
Acquisition-related Costs [Member] |  |  |  |
Pro forma adjustments, net income | 151,313 |  | 196,329 |
Depreciation and Amortization Costs [Member] |  |  |  |
Pro forma adjustments, net income | (81,881) | (163,762) | (81,881) | (163,762)
Tax Effect of Adjustments [Member] |  |  |  |
Pro forma adjustments, net income | $ (14,581) | $ 62,393 | $ (24,034) | $ 62,393

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
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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: |