XML 11 R1.htm IDEA: XBRL DOCUMENT v3.25.3
Document And Entity Information - shares
 9 Months Ended
Sep. 30, 2025
Nov. 05, 2025
Document Information [Line Items]    
Entity Central Index Key 0001710340  
Entity Registrant Name Eton Pharmaceuticals, Inc.  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2025  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2025  
Document Transition Report false  
Entity File Number 001-38738  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 37-1858472  
Entity Address, Address Line One 21925 W. Field Parkway, Suite 235  
Entity Address, City or Town Deer Park  
Entity Address, State or Province IL  
Entity Address, Postal Zip Code 60010-7278  
City Area Code 847  
Local Phone Number 787-7361  
Title of 12(b) Security Common stock, $0.001 par value per share  
Trading Symbol ETON  
Security Exchange Name NASDAQ  
Entity Current Reporting Status No  
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   26,817,535