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Document And Entity Information - USD ($)
 12 Months Ended
Sep. 30, 2023
Dec. 05, 2023
Mar. 31, 2023
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 30, 2023    
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    
16262 West Bernardo Drive, San Diego, California 92127    
City Area Code 858    
Local Phone Number 676-1112    
Title of 12(b) Security Common stock, $0.00001 par value per share    
GNSS GNSS    
Common stock, $0.00001 par value per share 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     $ 94,166,457
Entity Common Stock, Shares Outstanding (in shares)   44,027,121  
Auditor Firm ID 23    
Auditor Name BAKER TILLY US, LLP    
Auditor Location San Diego, California    
Entity Central Index Key 0000924383    
Current Fiscal Year End Date --09-30    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false