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Cover
Nov. 15, 2021
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Nov. 15, 2021
Entity File Number 001-38738
Entity Registrant Name Eton Pharmaceuticals, Inc.
Entity Central Index Key 0001710340
Entity Tax Identification Number 37-1858472
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 21925 W. Field Parkway
Entity Address, Address Line Two 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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, par value $0.001 per share
Trading Symbol ETON
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period true