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Note 18 - Major Customers (Details Textual) - Customer Concentration Risk [Member]	3 Months Ended
	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%

X

- 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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- Details

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X

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
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Period Type:

X

- Details

Name:	srt_MajorCustomersAxis=lrad_Customer1Member
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X

- Details

Name:	srt_MajorCustomersAxis=lrad_Customer2Member
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X

- Details

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