| Document And Entity Information | Oct. 04, 2023 |
| Document Information [Line Items] | |
| Entity, Registrant Name | ETON PHARMACEUTICALS, INC. |
| Document, Type | 8-K |
| Document, Period End Date | Oct. 04, 2023 |
| Entity, Incorporation, State or Country Code | DE |
| Entity, File Number | 001-38738 |
| 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 | 60010-7208 |
| 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 |
| Trading Symbol | ETON |
| Security Exchange Name | NASDAQ |
| Entity, Emerging Growth Company | true |
| Entity, Ex Transition Period | true |
| Amendment Flag | false |
| Entity, Central Index Key | 0001710340 |
