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Note 4 - Revenue Recognition - Contract Asset and Contract Liabilities (Details) - USD ($)	9 Months Ended
	Jun. 30, 2019	Sep. 30, 2018
Balance	$ 736,054
New performance obligations	3,033,917
Recognition of revenue as a result of satisfying performance obligations	(1,754,150)
Effect of exchange rate on deferred revenue	(6,596)
Balance	2,009,225
Less: non-current portion	(600,756)
Current portion	1,408,469
Customer Deposits [Member]
Balance	199,596
New performance obligations	1,588,880
Recognition of revenue as a result of satisfying performance obligations	(870,521)
Effect of exchange rate on deferred revenue
Balance	917,955
Less: non-current portion
Current portion	917,955	$ 199,596
Deferred Revenue [Member]
Balance	536,458
New performance obligations	1,445,037
Recognition of revenue as a result of satisfying performance obligations	(883,629)
Effect of exchange rate on deferred revenue	(6,596)
Balance	1,091,270
Less: non-current portion	(600,756)	(76,372)
Current portion	490,514	$ 460,086
Prepaid Maintenance Agreement [Member]
Balance	93,750
New prepaid maintenance agreements
Recognition of expense as a result of performing services	(93,750)
Balance

X

- Definition

Amount of increase in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, from new contract.

+ References

No definition available.

+ Details

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Namespace Prefix:	lrad_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents effect of exchange rate for contract with customer liability.

+ References

No definition available.

+ Details

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X

- Definition

Amount of increase in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from new contract.

+ References

No definition available.

+ Details

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X

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045

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X

- Definition

Amount of decrease in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time from transfer to receivable due to right to consideration becoming unconditional.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (d)
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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044

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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

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+ References

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