| Cover | May 13, 2022 |
| Cover [Abstract] | |
| Entity Registrant Name | Edesa Biotech, Inc. |
| Entity Central Index Key | 0001540159 |
| Document Type | 8-K |
| Amendment Flag | false |
| Entity Emerging Growth Company | false |
| Document Period End Date | May 13, 2022 |
| Entity Incorporation State Country Code | Z4 |
| Entity File Number | 001-37619 |
| Entity Address Address Line 1 | 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Shares |
| Trading Symbol | EDSA |
| Security Exchange Name | NASDAQ |
