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Note 2 - Basis of Presentation and Significant Accounting Policies (Details Textual) | 6 Months Ended
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Mar. 31, 2019
Number of Wholly Owned Subsidiaries | 3
Number of Reportable Segments | 2

X
- Definition Represents the number of wholly owned subsidiaries of the reporting entity as of a certain date. + References No definition available. + Details
Name: | lrad_NumberOfWhollyOwnedSubsidiaries
Namespace Prefix: | lrad_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration