| Cover - USD ($) | 12 Months Ended | ||
| Sep. 30, 2022 | Dec. 14, 2022 | Mar. 31, 2022 | |
| Cover [Abstract] | |||
| Document Type | 10-K/A | ||
| Amendment Flag | false | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Document Period End Date | Sep. 30, 2022 | ||
| Document Fiscal Period Focus | FY | ||
| Document Fiscal Year Focus | 2022 | ||
| Current Fiscal Year End Date | --09-30 | ||
| Entity File Number | 001-37619 | ||
| Entity Registrant Name | EDESA BIOTECH, INC. | ||
| Entity Central Index Key | 0001540159 | ||
| Entity Tax Identification Number | 00-0000000 | ||
| Entity Incorporation, State or Country Code | Z4 | ||
| Entity Address, Address Line One | 100 Spy Court | ||
| Entity Address, City or Town | Markham | ||
| Entity Address, State or Province | ON | ||
| Entity Address, Country | CA | ||
| Entity Address, Postal Zip Code | L3R 5H6 | ||
| City Area Code | 289 | ||
| Local Phone Number | 800-9600 | ||
| Title of 12(b) Security | Common Shares, without par value | ||
| Trading Symbol | EDSA | ||
| 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 Filer Category | Non-accelerated Filer | ||
| Entity Small Business | true | ||
| Entity Emerging Growth Company | false | ||
| Entity Shell Company | false | ||
| Entity Public Float | $ 35,987,404 | ||
| Entity Common Stock, Shares Outstanding | 19,353,351 | ||
| ICFR Auditor Attestation Flag | false | ||
| Auditor Name | MNP LLP | ||
| Auditor Location | Toronto, Canada | ||
| Auditor Firm ID | 1930 |
