XML 12 R1.htm IDEA: XBRL DOCUMENT v3.20.2
Document And Entity Information - shares
 9 Months Ended
Jun. 30, 2020
Aug. 07, 2020
Document Information [Line Items]    
Entity Registrant Name Genasys Inc.  
Entity Central Index Key 0000924383  
Trading Symbol gnss  
Current Fiscal Year End Date --09-30  
Entity Filer Category Non-accelerated Filer  
Entity Current Reporting Status Yes  
Entity Emerging Growth Company false  
Entity Small Business true  
Entity Interactive Data Current Yes  
Entity Common Stock, Shares Outstanding (in shares)   33,490,544
Entity Shell Company false  
Document Type 10-Q  
Document Period End Date Jun. 30, 2020  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Title of 12(b) Security Common stock, $0.00001 par value per share