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Document And Entity Information - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Dec. 04, 2024
Mar. 29, 2024
Document Information [Line Items]      
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date Sep. 30, 2024    
Document Transition Report false    
Entity File Number 0-24248    
Entity Registrant Name GENASYS INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 87-0361799    
Entity Address, Address Line One 16262 West Bernardo Drive,    
Entity Address, City or Town San Diego    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 92127    
City Area Code 858    
Local Phone Number 676-1112    
Title of 12(b) Security Common stock, $0.00001 par value per share    
Trading Symbol GNSS    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Small Business true    
Entity Filer Category Non-accelerated Filer    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 88.8
Entity Common Stock, Shares Outstanding (in shares)   44,928,967  
Entity Central Index Key 0000924383    
Current Fiscal Year End Date --09-30    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag true    
Amendment Description This Amendment No. 1 (this “Amendment”) amends the Annual Report on Form 10-K of Genasys Inc. for the year ended September 30, 2024, originally filed with the Securities and Exchange Commission on December 13, 2024 (the “Original Form 10-K”). This Amendment is being filed solely to include a conformed signature on Exhibit 32.1 that was inadvertently omitted from the Original Form 10-K. No other changes have been made to the Original Form 10-K.In connection with this Amendment No. 1, the Company is including updated certifications of its Chief Executive Officer and Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, as required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended.This Amendment does not reflect any changes to the financial statements or any other disclosures contained in the Original Form 10-K and does not update any information to reflect events occurring after the filing of the Original Form 10-K. Except as specifically noted above, this Amendment No. 1 continues to speak as of the date of the Original Form 10-K.    
Documents Incorporated by Reference [Text Block]

Portions of the registrant’s definitive proxy statement filed with the Commission pursuant to Regulation 14A in connection with the registrant’s 2025 Annual Meeting of Stockholders, to be filed subsequent to the date of this report, are incorporated by reference into Part III of this report. The definitive proxy statement will be filed with the Commission not later than 120 days after the conclusion of the registrant’s fiscal year ended September 30, 2024.