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Note 18 - Major Customers (Details Textual) - Customer Concentration Risk [Member] | 3 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Sales Revenue, Net [Member] |  |
Concentration Risk, Percentage | 60.00% |
Sales Revenue, Net [Member] | Customer 1 [Member] |  |
Concentration Risk, Percentage |  | 31.00%
Sales Revenue, Net [Member] | Customer 2 [Member] |  |
Concentration Risk, Percentage |  | 26.00%
Accounts Receivable [Member] |  |
Concentration Risk, Percentage | 64.00% | 42.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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Data Type: | num:percentItemType
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- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
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- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
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Data Type: | na
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- Details
Name: | srt_MajorCustomersAxis=lrad_Customer1Member
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Data Type: | na
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- Details
Name: | srt_MajorCustomersAxis=lrad_Customer2Member
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Data Type: | na
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- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
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Data Type: | na
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