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Note 9 - Commitments and Contingencies (Details Textual) (USD $)
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Target Bonus Amounts of Percentage of Employee Base Salary, Minimum 10.00%lrad_TargetBonusAmountsOfPercentageOfEmployeeBaseSalaryMinimum   10.00%lrad_TargetBonusAmountsOfPercentageOfEmployeeBaseSalaryMinimum  
Target Bonus Amounts of Percentage of Employee Base Salary Maximum 50.00%lrad_TargetBonusAmountsOfPercentageFEmployeeBaseSalaryMaximum   50.00%lrad_TargetBonusAmountsOfPercentageFEmployeeBaseSalaryMaximum  
Level 1 [Member]        
Payment of Bonus as Percentage     50.00%lrad_PaymentOfBonusAsPercentage
/ us-gaap_RangeAxis
= lrad_Level1Member
 
Level 2 [Member]        
Payment of Bonus as Percentage     100.00%lrad_PaymentOfBonusAsPercentage
/ us-gaap_RangeAxis
= lrad_Level2Member
 
Level 3 [Member]        
Payment of Bonus as Percentage     200.00%lrad_PaymentOfBonusAsPercentage
/ us-gaap_RangeAxis
= lrad_Level3Member
 
Bonuses and Related Payroll Tax Expense [Member]        
Increase (Decrease) in Other Employee Related Liabilities $ 152,819us-gaap_IncreaseDecreaseInOtherEmployeeRelatedLiabilities
/ us-gaap_NatureOfExpenseAxis
= lrad_BonusesAndRelatedPayrollTaxExpenseMember
$ 338,151us-gaap_IncreaseDecreaseInOtherEmployeeRelatedLiabilities
/ us-gaap_NatureOfExpenseAxis
= lrad_BonusesAndRelatedPayrollTaxExpenseMember
$ 323,098us-gaap_IncreaseDecreaseInOtherEmployeeRelatedLiabilities
/ us-gaap_NatureOfExpenseAxis
= lrad_BonusesAndRelatedPayrollTaxExpenseMember
$ 338,151us-gaap_IncreaseDecreaseInOtherEmployeeRelatedLiabilities
/ us-gaap_NatureOfExpenseAxis
= lrad_BonusesAndRelatedPayrollTaxExpenseMember