Significant Accounting Policies (Policies)	12 Months Ended
Significant Accounting Policies (Policies)	Sep. 30, 2018
Accounting Policies [Abstract]
Consolidation, Policy [Policy Text Block]	PRINCIPLES OF CONSOLIDATION The Company has three wholly owned subsidiaries, Genasys II Spain, S.A.U. and two currently inactive subsidiaries, Genasys America de CV and LRAD International Corporation. The consolidated financial statements include the accounts of these subsidiaries after elimination of intercompany transactions and accounts.
Use of Estimates, Policy [Policy Text Block]	USE OF ESTIMATES The preparation of financial statements in conformity with generally accepted accounting principles in the United States requires management to make estimates and assumptions (e.g., share-based compensation valuation, allowance for doubtful accounts, valuation of inventory and intangible assets, warranty reserve, accrued bonus and valuation allowance related to deferred tax assets) that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities at the date of the financial statements and affect the reported amounts of revenues and expenses during the reporting periods. Actual results could materially differ from those estimates.
Concentration Risk, Credit Risk, Policy [Policy Text Block]	CONCENTRATION OF CREDIT RISK The Company sells its products to a large number of geographically diverse customers. The Company routinely assesses the financial strength of its customers and generally does not require collateral or other security to support customer receivables. At September 30, 2018, accounts receivable from two customers accounted for 12% and 11% of total accounts receivable with no other single customer accounting for more than 10% of the accounts receivable balance. At September 30, 2017, accounts receivable from three customers accounted for 31%, 22% and 14% of total accounts receivable with no other single customer accounting for more than 10% of the accounts receivable balance. The Company maintains cash and cash equivalent bank deposit accounts which, at times, may exceed federally insured limits guaranteed by the Federal Deposit Insurance Corporation (“FDIC”). The Company has not experienced any losses in such accounts. The Company limits its exposure to credit loss by depositing its cash with high credit quality financial institutions. The Company also invests cash in instruments that meet high credit quality standards, as specified in the Company’s policy guidelines such as money market funds, corporate bonds, municipal bonds and Certificates of Deposit. These guidelines also limit the amount of credit exposure to any one issue, issuer or type of instrument. It is generally the Company’s policy to invest in instruments that have a final maturity of no longer than three years, with a portfolio weighted average maturity of no longer than 18 months.
Cash and Cash Equivalents, Policy [Policy Text Block]	CASH, CASH EQUIVALENTS, AND RESTRICTED CASH The Company considers all highly liquid investments with an original maturity of three months or less, when purchased, to be cash equivalents. The Company considers any amounts pledged as collateral or otherwise restricted for use in current operations to be restricted cash. Restricted cash is classified as a current asset unless amounts are not expected to be released and available for use in operations within one year. At September 30, 2018 and 2017, the amount of restricted cash was $742,983 and $39,446, which is included in Restricted Cash and Long-term Restricted Cash.
Marketable Securities, Policy [Policy Text Block]	MARKETABLE SECURITIES The Company accounts for investments in debt instruments as available-for-sale. Management determines the appropriate classification of such securities at the time of purchase and re-evaluates such classification as of each balance sheet date. Marketable securities are reported at fair value with the related unrealized gains and losses included in accumulated other comprehensive loss. The realized gains and losses on marketable securities are determined using the specific identification method.
Trade and Other Accounts Receivable, Policy [Policy Text Block]	ACCOUNTS RECEIVABLE AND ALLOWANCE FOR DOUBTFUL ACCOUNTS The Company carries its accounts receivable at their historical cost, less an allowance for doubtful accounts. On a periodic basis, the Company evaluates its accounts receivable and establishes an allowance for doubtful accounts for estimated losses considering the following factors when determining if collection of a receivable is reasonably assured: customer credit-worthiness, past transaction history with the customer, current economic industry trends and changes in customer payment terms. If the Company has no previous experience with the customer, the Company may obtain reports from various credit organizations to ensure that the customer has a history of paying its creditors. The Company may also request financial information to ensure that the customer has the means of making payment. If these factors do not indicate collection is reasonably assured, revenue is deferred until collection becomes reasonably assured, which is generally upon receipt of cash. There was no deferred revenue at September 30, 2018 or 2017 as a result of collection issues. If the financial condition of the Company’s customers were to deteriorate, adversely affecting their ability to make payments, additional allowances would be required. The Company determines allowances on a customer specific basis. At September 30, 2018 and 2017, the Company had an allowance for doubtful accounts of $150,000 and $0, respectively.
Contract Manufacturers, Policy [Policy Text Block]	CONTRACT MANUFACTURERS The Company employs contract manufacturers for production of certain components and sub-assemblies. The Company may provide parts and components to such parties from time to time, but recognizes no revenue or markup on such transactions. During fiscal years 2018 and 2017, the Company performed assembly of products in-house using components and sub-assemblies from a variety of contract manufacturers and suppliers.
Inventory, Policy [Policy Text Block]	INVENTORIES Inventories are valued at the lower of cost or net realizable value. Cost is determined using a standard cost system whereby differences between the standard cost and purchase price are recorded as a purchase price variance in cost of revenues. Inventory is comprised of raw materials, assemblies and finished products intended for sale . The Company periodically makes judgments and estimates regarding the future utility and carrying value of inventory. The carrying value of inventory is periodically reviewed and impairments, if any, are recognized when the expected net realizable value is less than carrying value. The Company has inventory reserves for estimated obsolescence or unmarketable inventory, which is equal to the difference between the cost of inventory and the estimated market value, based upon assumptions about future demand and market conditions. The Company decreased its inventory reserve by $21,481 and $161,600 during the years ended September 30, 2018 and 2017, respectively. These changes resulted from the disposal of obsolete inventory, net of additional excess and obsolescence reserves recorded in 2018 and 2017.
Property, Plant and Equipment, Policy [Policy Text Block]	EQUIPMENT AND DEPRECIATION Equipment is stated at cost. Depreciation on machinery and equipment and office furniture and equipment is computed over the estimated useful lives of two to seven years using the straight-line method. Leasehold improvements are amortized over the life of the lease. Upon retirement or disposition of equipment, the related cost and accumulated depreciation is removed, and a gain or loss is recorded
Business Combinations Policy [Policy Text Block]	BUSINESS COMBINATIONS The acquisition method of accounting for business combinations requires the Company to use significant estimates and assumptions, including fair value estimates, as of the business combination date and to refine those estimates as necessary during the measurement period (defined as the period, not to exceed one year, in which the Company may adjust the provisional amounts recognized for a business combination). Under the acquisition method of accounting the Company recognizes separately from goodwill the identifiable assets acquired, the liabilities assumed generally at the acquisition date fair value. The Company measures goodwill as of the acquisition date as the excess of consideration transferred, which the Company also measures at fair value, over the net of the acquisition date amounts of the identifiable assets acquired and liabilities assumed. Costs that the Company incurs to complete the business combination such as investment banking, legal and other professional fees are not considered part of consideration and the Company charges them to general and administrative expense as they are incurred. Under the acquisition method of accounting for business combinations, if the Company identifies changes to acquired deferred tax asset valuation allowances or liabilities related to uncertain tax positions during the measurement period and they relate to new information obtained about facts and circumstances that existed as of the acquisition date, those changes are considered a measurement period adjustment and the Company records the offset to goodwill. The Company records all other changes to deferred tax asset valuation allowances and liabilities related to uncertain tax positions in current period income tax expense. On January 18, 2018, the Company acquired all of the issued and outstanding shares of capital stock of Genasys pursuant to a Stock Purchase Agreement, dated January 18, 2018. See Note 4, Acquisition, for additional information about this transaction.
Goodwill and Intangible Assets, Policy [Policy Text Block]	GOODWILL AND INTANGIBLE ASSET S Identifiable intangible assets, which consist of technology, customer relationships, non-compete agreements, patents, tradenames and trademarks, are carried at cost less accumulated amortization. Intangible assets are amortized over their estimated useful lives, based on a number of assumptions including estimated periodic economic benefit and utilization. The estimated useful lives of identifiable intangible assets has been estimated to be between three and fifteen years. The carrying value of intangibles is periodically reviewed and impairments, if any, are recognized when the future undiscounted cash flows realized from the assets is less than its carrying value. Goodwill represents the excess of the value of the purchase price and related costs over the identifiable assets from the acquisition of Genasys, as described in Note 4, Acquisition. The Company conducts an annual impairment assessment, at the reporting unit level, of its recorded goodwill. The Company assesses qualitative factors in order to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. The qualitative factors evaluated by the Company include: macro-economic conditions of the local business environment, overall financial performance, and other entity specific factors as deemed appropriate. If, through this qualitative assessment, the conclusion is made that it is more likely than not that a reporting unit’s fair value is less than its carrying amount, a two -step impairment test is performed. Management does not consider the value of goodwill recorded for Genasys in the accompanying consolidated balance sheet to be impaired as of September 30, 2018. ( See Note 8, Goodwill and Intangible Assets for more information)
Lessee, Leases [Policy Text Block]	LEASES Leases entered into are classified as either capital or operating leases. At the time a capital lease is entered into, an asset is recorded, together with its related long-term obligation to reflect the purchase and financing. At September 30, 2018 and 2017, the Company had no capital lease obligations.
Revenue Recognition, Policy [Policy Text Block]	REVENUE RECOGNITION The Company derives its revenue from the sale of products to customer, contracts, license fees, other services and freight. The Company sells its products through its direct sales force and through authorized resellers and system integrators. The Company recognizes revenue for goods including software when all the significant risks and rewards have been transferred to the customer, no continuing managerial involvement usually associated with ownership of the goods is retained, no effective control over the goods sold is retained, the amount of revenue can be measured reliably, it is probable that the economic benefits associated with the transactions will flow to the entity and the costs incurred or to be incurred in respect of the transaction can be measured reliably. Software license revenue, maintenance and/or software development service fees may be bundled in one arrangement or may be sold separately. Product Revenue The Company sells its products to customers, including resellers and system integrators, is recognized in the periods that products are shipped (free on board (“FOB”) shipping point) or received by customers (FOB destination), when the fee is fixed or determinable, when collection of resulting receivables is reasonably assured, and when there are no remaining obligations. Most revenues to resellers and system integrators are based on firm commitments from the end user, and as a result, resellers and system integrators carry little or no inventory. Our customers do not have the right to return product unless the product is found to be defective. Perpetual licensed software The sale and/or license of software products is deemed to have occurred when a customer either has taken possession of or has the ability to take immediate possession of the software and the software key. Perpetual software licenses can include one year maintenance and support services. The Company sells these maintenance services also on a stand-alone basis and is therefore capable of determining their fair value. On this basis, the amount of the embedded maintenance is separated from the fee for the perpetual license and is recognized on a straight-line basis over the period to which they relate. Time-based licensed software The time-based license agreements include the use of a software license for a fixed term, generally one -year, and maintenance and support services during the same period. The Company does not sell time-based licenses without maintenance and support services and therefore revenues for the entire arrangements are recognized on a straight-line basis over the term. Warranty, maintenance and services We also offer extended warranty, maintenance and other services. Extended warranty and maintenance contracts are offered with terms ranging from one to several years, which provide repair and maintenance services after expiration of the original one -year warranty term. Revenues from separately priced extended warranty and maintenance contracts are recognized on a straight-line basis, over the contract period, and classified as contract and other revenues. Revenue from other services such as training or installation is recognized when the service is completed. Multiple element arrangements The Company has entered into a number of multiple element arrangements, such as when selling a product or perpetual licenses that may include maintenance and support (included in price of perpetual licenses) and time-based licenses (that include embedded maintenance and support, both of which may be sold with software development services, training, and other product sales). In some cases, the Company delivers software development services bundled with the sale of the software. In multiple element arrangements, the Company uses either the stand-alone selling price or vendor specific objective evidence to determine the fair value of each element within the arrangement, including software and software-related services such as maintenance and support. In general, elements in such arrangements are also sold on a stand-alone basis and stand-alone selling prices are available. Revenue is allocated to each deliverable based on the fair value of each individual element and is recognized when the revenue recognition criteria described above are met, except for time-based licenses which are not unbundled. When software development services are performed and are considered essential to the functionality of the software, the Company recognizes revenue from the software development services on a stage of completion basis, and the revenue from the software when the related development services have been completed. Adoption of new accounting standard On October 1, 2018, the Company adopted the new accounting standard FASB Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers (“ASC 606” ) for all contracts using the modified retrospective method. Based on the Company’s analysis of contracts with customers in prior periods, there was no cumulative effect adjustment to the opening balance of the Company’s accumulated deficit as a result of the adoption of this new standard. We expect the impact of the adoption of the new standard to be immaterial to the consolidated financial statements on an ongoing basis.
Shipping and Handling Cost, Policy [Policy Text Block]	SHIPPING AND HANDLING COSTS Shipping and handling costs are included in cost of revenues. Shipping and handling costs invoiced to customers are included in revenue. Actual shipping and handling costs were $291,994 and $148,862 for the fiscal years ended September 30, 2018 and 2017, respectively. Actual revenues from shipping and handling were $169,184 and $124,141 for the fiscal years ended September 30, 2018 and 2017, respectively.
Advertising Costs, Policy [Policy Text Block]	ADVERTISING Advertising costs are charged to expense as incurred. The Company expensed $28,092 and $42,232 for the years ended September 30, 2018 and 2017, respectively, for advertising costs.
Research and Development Expense, Policy [Policy Text Block]	RESEARCH AND DEVELOPMENT COSTS Research and development costs are expensed as incurred.
Standard Product Warranty, Policy [Policy Text Block]	WARRANTY RESERVES The Company warrants its products to be free from defects in materials and workmanship for a period of one year from the date of purchase. The warranty is generally limited. The Company currently provides direct warranty service. Some agreements with OEM customers, from time to time, may require that certain quantities of product be made available for use as warranty replacements. International market warranties are generally similar to the U.S. market. The Company also sells extended warranty contracts and maintenance agreements. The Company establishes a warranty reserve based on anticipated warranty claims at the time product revenues are recognized. Factors affecting warranty reserve levels include the number of units sold, anticipated cost of warranty repairs and anticipated rates of warranty claims. The Company evaluates the adequacy of the provision for warranty costs each reporting period. The warranty reserve was $99,216 and $104,578 at September 30, 2018 and 2017, respectively.
Income Tax, Policy [Policy Text Block]	INCOME TAXES The Company determines its income tax provision using the asset and liability method. Temporary differences are differences between the tax basis of assets and liabilities and their reported amounts in the financial statements that will result in taxable or deductible amounts in future years. A valuation allowance is recorded by the Company to the extent it is more likely than not that some portion or all of the deferred tax asset will not be realized. Significant management judgment is required in assessing the ability to realize the Company’s deferred tax assets. The ultimate realization of deferred tax assets is dependent upon generation of future taxable income and the tax rates in effect at that time. Additional information regarding income taxes appears in Note 12, Income Taxes.
Property, Plant and Equipment, Impairment [Policy Text Block]	IMPAIRMENT OF LONG-LIVED ASSETS Long-lived assets and identifiable intangibles held for use are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. If the sum of undiscounted expected future cash flows is less than the carrying amount of the asset, or if changes in facts and circumstances indicate this, an impairment loss is measured and recognized using the asset’s fair value.
Segment Reporting, Policy [Policy Text Block]	SEGMENT INFORMATION The Company is engaged in the design, development and commercialization of directed and multidirectional sound technologies, voice broadcast products and location-based mass messaging solutions for emergency warning and workforce management. The Company operates in two business segments: Hardware (LRAD) and Software (Genasys) and its principle markets are North and South America, Europe, Middle East and Asia. As reviewed by the Company’s chief operating decision maker, the Company evaluates the performance of each segment based on sales and operating income. Cash and cash equivalents, marketable securities, accounts receivable, inventory, property and equipment, deferred tax assets, goodwill and intangible assets are primary assets identified by segment. The accounting policies for segment reporting are the same for the Company as a whole and transactions between the two operating segments are not material. See Note 17, Segment Information, for additional information.
Earnings Per Share, Policy [Policy Text Block]	NET (LOSS) INCOME PER SHARE Basic net (loss) income per share is computed by dividing net (loss) income by the weighted average number of common shares outstanding for the period. Diluted net (loss) income per share reflects the potential dilution of securities that could occur if outstanding securities convertible into common stock were exercised or converted. See Note 16, Net Loss Per Share, for additional information.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	FOREIGN CURRENCY TRANSLATION The Company’s reporting currency is U.S. dollars. The functional currency of LRAD is the U.S. dollar. The functional currency of Genasys is the Euro. The Company translates the assets and liabilities of Genasys at the exchange rates in effect on the balance sheet date. The Company translates the revenue, costs and expenses of Genasys at the average rates of exchange in effect during the period. The Company includes translation gains and losses in the stockholders’ equity section of the Company’s balance sheets in accumulated other comprehensive income or loss. Transactions undertaken in other currencies, which have not been material, are translated using the exchange rate in effect as of the transaction date and any exchange gains and losses resulting from these transactions, are included in the statements of operations. The translation loss for the period was $236,430 resulting from transaction between LRAD and Genasys and the timing of transaction in relation to changes in exchange rates. Transaction gains and losses were not significant for any period presented.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	SHARE-BASED COMPENSATION The Company recognized share-based compensation expense related to qualified and non-qualified stock options issued to employees and directors over the expected vesting term of the stock-based instrument based on the grant date fair value. Forfeitures are estimated at the time of the grant and revised in subsequent periods if actual forfeitures differ from those estimates or if the Company updates its estimated forfeiture rate. See Note 14, Share-based Compensation, for additional information.
Reclassification, Policy [Policy Text Block]	RECLASSIFICATIONS Where necessary, the prior year’s information has been reclassified to conform to the fiscal year 2018 statement presentation. These reclassifications had no effect on previously reported results of operations or accumulated deficit.
Subsequent Events, Policy [Policy Text Block]	SUBSEQUENT EVENTS Management has evaluated events subsequent to September 30, 2018 through the date the accompanying consolidated financial statements were filed with the Securities and Exchange Commission and noted that there have been no events or transactions which would affect the Company’s consolidated financial statements for the year ended September 30, 2018.
New Accounting Pronouncements, Policy [Policy Text Block]	In June 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2018 - 7, Compensation – Stock Compensation (Topic 718 ), Improvements to Nonemployee Share-Based Payment Accounting (“ASU 2018 - 7” ), which amends and expands Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. The standard requires entities to measure nonemployee share-based payment transactions by estimating the fair value of the equity instrument it is obligated to issue, measure the equity-classified nonemployee share-based payment awards at the grant date, and consider the probability of satisfying performance conditions when accounting for nonemployee share based payment awards with such conditions. ASU 2018 - 7 is effective for annual reporting periods beginning after December 15, 2018, including interim periods within that fiscal year. Accordingly, this guidance will be effective for the Company in the fiscal year beginning October 1, 2019. The Company is currently evaluating the impact adoption of this guidance, if any, will have on its consolidated financial statements and related disclosures. In February 2018, the FASB issued ASU 2018 - 02, Income Statement—Reporting Comprehensive Income (Topic 220 ). The amendments in this ASU allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. Consequently, the amendments eliminate the stranded tax effects resulting from the Tax Cuts and Jobs Act and will improve the usefulness of information reported to financial statement users. However, because the amendments only relate to the reclassification of the income tax effects of the Tax Cuts and Jobs Act, the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations is not affected. The amendments in this update also require certain disclosures about stranded tax effects. The guidance is effective for fiscal years beginning after December 15, 2018 with early adoption permitted, including interim periods within those years. The Company expects that the adoption of this ASU will not have a material impact on its consolidated financial statements. In November 2016, the FASB issued ASU No. 2016 - 18, Statement of Cash Flows (Topic 230 ), Restricted Cash, which amends Topic 230 to add or clarify guidance on the classification and presentation of restricted cash in the statement of cash flows. The standard requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The provisions of this guidance are to be applied using a retrospective transition method to each period presented. ASU 2016 - 18 was effective for annual reporting periods beginning after December 15, 2017, and interim periods within those years, with early adoption permitted. The Company adopted ASU 2016 - 18 effective January 1, 2018. For the year ended September 30, 2018, the increase in restricted cash resulted primarily from restricted cash balances associated with the security deposit for the Company’s new office lease, as described in Note13 and restricted cash included in the assets acquired in the acquisition of Genasys, as described in Note 4, Acquisition. The adoption did not have a material impact on the Company's consolidated financial position, results of operations and cash flows, other than the impact discussed above. In March 2016, the FASB issued ASU No. 2016 - 09, Compensation – Stock Compensation (Topic 718 ): Improvements to Employee Share-Based Payment Accounting . This guidance changes how companies account for certain aspects of share-based payments to employees. Among other things, under the new guidance, companies will no longer record excess tax benefits and certain tax deficiencies in additional paid-in-capital (“APIC”), but will instead record such items as income tax expense or benefit in the income statement, and APIC pools will be eliminated. Companies will apply this guidance prospectively. Another component of the new guidance allows companies to make an accounting policy election for the impact of forfeitures on the recognition of expense for share-based payment awards, whereby forfeitures can be estimated, as required today, or recognized when they occur. If elected, the change to recognize forfeitures when they occur needs to be adopted using a modified retrospective approach. The guidance was effective for the Company in the first quarter of fiscal 2018. The adoption of this standard resulted in the recognition of $1.1 million of gross deferred tax assets related to the historical excess tax benefits from stock based compensation what was not previously included in deferred tax assets and a corresponding increase in the Company’s valuation allowance. In February 2016, the FASB issued ASU 2016 - 02, Leases (Topic 842 ) , which issued new guidance related to leases that outlines a comprehensive lease accounting model and supersedes the current lease guidance. The new guidance requires lessees to recognize lease liabilities and corresponding right-of-use assets for all leases with lease terms of greater than 12 months. It also changes the definition of a lease and expands the disclosure requirements of lease arrangements. The new guidance must be adopted using the modified retrospective approach and will be effective for the Company in the fiscal year beginning October 1, 2019. Early adoption is permitted. The Company is currently evaluating the impact adoption of this guidance, if any, will have on its consolidated financial statements and related disclosures. In May 2014, the FASB issued ASU No. 2014 - 09, Revenue from Contracts with Customers (“ASU 2014 - 09” ), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. ASU 2014 - 09 will replace most existing revenue recognition guidance in U.S. generally accepted accounting principles when it becomes effective. In July 2015, the FASB deferred the effective date of the standard by an additional year; however, it provided companies the option to adopt one year earlier, commensurate with the original effective date. Accordingly, the standard will be effective for the Company in the fiscal year beginning October 1, 2018. Subsequently the FASB has issued additional guidance (ASUs 2015 - 14; 2016 - 08; 2016 - 10; 2016 - 12; 2016 - 13; 2016 - 20 ). The adoption of this guidance by the Company, effective October 1, 2018, did not have a material impact on the Company’s consolidated financial statements (see Note 2, Basis of Presentation and Significant Accounting Policies – Revenue Recognition, for further detail).