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Note 9 - Commitments and Contingencies (Details Textual) - USD ($)	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Target Bonus Amounts of Percentage of Employee Base Salary, Minimum	25.00%
Target Bonus Amounts of Percentage of Employee Base Salary Maximum	75.00%
Payment of Bonus as Percentage, Level 1	50.00%
Payment of Bonus as Percentage, Level 2	100.00%
Payment of Bonus as Percentage, Level 3	200.00%
Bonuses and Related Payroll Tax Expense [Member]
Increase (Decrease) in Other Employee-Related Liabilities	$ 405,267	$ 185,086

X

- Definition

Represents the payment of a bonus as a percentage for level one of the target salary.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the payment of a bonus as a percentage for level two of the target salary.

+ References

No definition available.

+ Details

Name:	lrad_PaymentOfBonusAsPercentageLevel2
Namespace Prefix:	lrad_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the payment of a bonus as a percentage for level three of the target salary.

+ References

No definition available.

+ Details

Name:	lrad_PaymentOfBonusAsPercentageLevel3
Namespace Prefix:	lrad_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the target bonus amounts of percentage of employee base salary maximum.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the target bonus amounts of percentage of employee base salary minimum.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of increase (decrease) in employer-related costs classified as other and current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

+ Details

Name:	us-gaap_IncreaseDecreaseInOtherEmployeeRelatedLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_NatureOfExpenseAxis=lrad_BonusesAndRelatedPayrollTaxExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: