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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: