Major Customers (Details Textual)	3 Months Ended	9 Months Ended
Jun. 30, 2012 customers	Jun. 30, 2011 customers	Jun. 30, 2012 customers	Jun. 30, 2011 customers
Major Customers (Additional Textual) [Abstract]
Number of customers, recorded more than 10% of revenues	1	2	3	1
Minimum percentage of revenue require to be disclosed as major customer			10.00%	10.00%
Number of customers, recorded more than 10% of Accounts receivable			1	4
Minimum percentage of accounts receivable require to be disclosed as major customer			10.00%	10.00%
Customer 1 [Member]
Major Customers (Textual) [Abstract]
Revenues from customers	39.00%	13.00%	18.00%	60.00%
Accounts receivable from customers	24.00%	19.00%	24.00%	19.00%
Customer 2 [Member]
Major Customers (Textual) [Abstract]
Revenues from customers		12.00%	11.00%
Accounts receivable from customers	19.00%	14.00%	19.00%	14.00%
Customer 3 [Member]
Major Customers (Textual) [Abstract]
Revenues from customers			10.00%
Accounts receivable from customers		13.00%		13.00%
Customer 4 [Member]
Major Customers (Textual) [Abstract]
Accounts receivable from customers		11.00%		11.00%

Entity wide accounts receivable major customer percentage.

No definition available.

Name:	lrad_EntityWideAccountsReceivableMajorCustomerPercentage
Namespace Prefix:	lrad_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Name:	lrad_MajorCustomersAdditionalTextualAbstract
Namespace Prefix:	lrad_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	lrad_MajorCustomersTextualAbstract
Namespace Prefix:	lrad_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Minimum percentage of accounts receivable require to be disclosed as major customer.

No definition available.

Name:	lrad_MinimumPercentageOfAccountsReceivableRequireToBeDisclosedAsMajorCustomer
Namespace Prefix:	lrad_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Minimum percentage of revenue require to be disclosed as major customer.

No definition available.

Name:	lrad_MinimumPercentageOfRevenueRequireToBeDisclosedAsMajorCustomer
Namespace Prefix:	lrad_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Number of customers attaining specified percentage of accounts receivable.

No definition available.

Name:	lrad_NumberOfCustomersAttainingSpecifiedPercentageOfAccountsReceivable
Namespace Prefix:	lrad_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Number of customers attaining specified percentage of revenue.

No definition available.

Name:	lrad_NumberOfCustomersAttainingSpecifiedPercentageOfRevenue
Namespace Prefix:	lrad_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

No definition available.

Name:	us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration