| Document And Entity Information | Nov. 11, 2021 |
| Document Information [Line Items] | |
| Entity, Registrant Name | Genasys Inc. |
| Document, Type | 8-K |
| Document, Period End Date | Nov. 11, 2021 |
| Entity, Incorporation, State or Country Code | DE |
| Entity, File Number | 000-24248 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity, Emerging Growth Company | false |
| Title of 12(b) Security | Common stock |
| Trading Symbol | GNSS |
| Security Exchange Name | NASDAQ |
| Amendment Flag | false |
| Entity, Central Index Key | 0000924383 |
