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Note 19 - Major Customers, Suppliers and Related Information (Details Textual) - Customer Concentration Risk [Member] | 3 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Revenue Benchmark [Member] |  |
Number Of Major Customers | 2 | 1
Revenue Benchmark [Member] | Customer 1 [Member] |  |
Concentration Risk, Percentage | 62.00% | 60.00%
Revenue Benchmark [Member] | Customer 2 [Member] |  |
Concentration Risk, Percentage | 13.00% |
Accounts Receivable [Member] |  |
Number Of Major Customers | 2 | 1
Accounts Receivable [Member] | Customer 1 [Member] |  |
Concentration Risk, Percentage | 66.00% | 64.00%
Accounts Receivable [Member] | Customer 2 [Member] |  |
Concentration Risk, Percentage | 10.00% |

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- Definition Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc. + References No definition available. + Details
Name: | lrad_NumberOfMajorCustomers
Namespace Prefix: | lrad_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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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=118260190&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=118260190&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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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | srt_MajorCustomersAxis=lrad_Customer1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MajorCustomersAxis=lrad_Customer2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |