Note 3 - Recent Accounting Pronouncements (Details Textual) - Computer Software, Intangible Asset [Member]	6 Months Ended
Dec. 31, 2020
Minimum [Member]
Finite-lived Intangible Assets, Renewal Period (Year)	1 year
Maximum [Member]
Finite-lived Intangible Assets, Renewal Period (Year)	3 years

The period for renewal of finite-lived intangible asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	eth_FinitelivedIntangibleAssetsRenewalPeriod
Namespace Prefix:	eth_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration