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Document And Entity Information - shares
 6 Months Ended
Mar. 31, 2025
May 14, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2025  
Document Transition Report false  
Entity File Number 001-37619  
Entity Registrant Name EDESA BIOTECH, INC.  
Entity Incorporation, State or Country Code CA  
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 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 Common Stock, Shares Outstanding (in shares)   7,022,678
Entity Central Index Key 0001540159  
Current Fiscal Year End Date --09-30  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Amendment Flag false