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Note 8 - Common Stock Warrants - Summary of Rollforward of The Warrants Outstanding (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2024
Balance (in shares) |  | 69,380
Balance (in shares) |  | 359,116
SWK Warrants – Debt – Tranche #3 [Member] |  |
Issuance of SWK Warrants - Debt (Tranche #3) | $ 289,736 | $ 289,736

X
- Definition The number of warrants or rights issued during period. + References No definition available. + Details
Name: | eton_ClassOfWarrantOrRightIssuedDuringPeriod
Namespace Prefix: | eton_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=eton_SWKWarrantsDebtTranche3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |