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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating Activities:
Net income	$ 796,145us-gaap_NetIncomeLoss	$ 657,489us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	120,074us-gaap_DepreciationAndAmortization	87,436us-gaap_DepreciationAndAmortization
Provision for doubtful accounts		8,036us-gaap_ProvisionForDoubtfulAccounts
Warranty provision	(40,674)us-gaap_ProductWarrantyExpense	(83,518)us-gaap_ProductWarrantyExpense
Inventory obsolescence	22,908lrad_InventoryObsolescenceWriteDownRecoveries	(33,088)lrad_InventoryObsolescenceWriteDownRecoveries
Share-based compensation	308,854us-gaap_ShareBasedCompensation	341,422us-gaap_ShareBasedCompensation
Loss on sale or impairment of patents		6,980us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Changes in operating assets and liabilities:
Accounts receivable	1,936,920us-gaap_IncreaseDecreaseInAccountsReceivable	2,190,096us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories	(689,050)us-gaap_IncreaseDecreaseInInventories	(873,904)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other	(169,544)us-gaap_IncreaseDecreaseInPrepaidExpense	377,698us-gaap_IncreaseDecreaseInPrepaidExpense
Prepaid expenses and other, noncurrent	93,743us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	93,750us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable	206,149us-gaap_IncreaseDecreaseInAccountsPayable	(478,789)us-gaap_IncreaseDecreaseInAccountsPayable
Warranty settlements	(27,749)us-gaap_ProductWarrantyAccrualPayments	(36,069)us-gaap_ProductWarrantyAccrualPayments
Accrued and other liabilities	(2,617,351)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	565,906us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities
Net cash provided by operating activities	21,773us-gaap_NetCashProvidedByUsedInOperatingActivities	2,990,481us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing Activities:
Purchases of marketable securities	(4,544,977)us-gaap_PaymentsToAcquireMarketableSecurities
Capital expenditures	(170,999)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	(203,876)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Patent costs paid	(1,087)us-gaap_PaymentsToAcquireIntangibleAssets	(3,645)us-gaap_PaymentsToAcquireIntangibleAssets
Net cash used in investing activities	(4,717,063)us-gaap_NetCashProvidedByUsedInInvestingActivities	(207,521)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing Activities:
Repurchase of common stock	(158,740)us-gaap_PaymentsForRepurchaseOfCommonStock	(248,957)us-gaap_PaymentsForRepurchaseOfCommonStock
Proceeds from exercise of stock options	107,214us-gaap_ProceedsFromStockOptionsExercised	193,064us-gaap_ProceedsFromStockOptionsExercised
Net cash used in financing activities	(51,526)us-gaap_NetCashProvidedByUsedInFinancingActivities	(55,893)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net (decrease) increase in cash	(4,746,816)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	2,727,067us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period	23,894,744us-gaap_CashAndCashEquivalentsAtCarryingValue	15,805,195us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period	19,147,928us-gaap_CashAndCashEquivalentsAtCarryingValue	18,532,262us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Disclosure of Cash Flow Information
Cash paid for taxes		$ 100us-gaap_IncomeTaxesPaid

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