| Document And Entity Information - USD ($) $ in Millions | 12 Months Ended | ||
| Dec. 31, 2023 | Mar. 21, 2024 | Jun. 30, 2023 | |
| Document Information [Line Items] | |||
| Entity, Registrant Name | ETON PHARMACEUTICALS, INC. | ||
| Document, Type | 10-K/A | ||
| Document, Annual Report | true | ||
| Document, Period End Date | Dec. 31, 2023 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Document, Fiscal Period Focus | FY | ||
| Document, Fiscal Year Focus | 2023 | ||
| 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 | ||
| Trading Symbol | ETON | ||
| Security Exchange Name | NASDAQ | ||
| Entity, Well-known Seasoned Issuer | No | ||
| Entity, Voluntary Filers | No | ||
| 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 | ||
| ICFR Auditor Attestation Flag | false | ||
| Document, Financial Statement Error Correction Flag | false | ||
| Entity, Shell Company | false | ||
| Entity, Public Float | $ 84.7 | ||
| Entity, Common Stock Shares, Outstanding | 25,688,062 | ||
| Amendment Description | Eton Pharmaceuticals, Inc. (the “Company”) is filing this Amendment No. 1 on Form 10-K/A (the “Amended 10-K”) to amend the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2023 (the “Original 10-K”), originally filed with the Securities and Exchange Commission (the “SEC”) on March 14, 2023, solely to amend the Consent of KMJ Corbin & Company LLP, Irvine, California, PCAOB ID: 170, the Company's Independent Registered Public Accounting Firm, included as Exhibit No. 23.1. Except as described above, no other amendments are being made to the Original 10-K. This Amended 10-K does not reflect events occurring after the filing of the Original 10-K or modify or update the disclosure contained therein in any way other than as required to reflect the amendments discussed above. The Company has attached to this Amended 10-K updated certifications executed as of the date of this Amended 10-K by the Principal Executive Officer and Principal Financial Officer as required by Sections 302 and 906 of the Sarbanes Oxley Act of 2002. These updated certifications are attached as Exhibits 31.1/31.2 and 32.1 to this Amended 10-K. | ||
| Amendment Flag | true | ||
| Entity, Central Index Key | 0001710340 |
