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Note 3 - Recent Accounting Pronouncements (Details Textual) - Computer Software, Intangible Asset [Member] | 9 Months Ended
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Mar. 31, 2021
Minimum [Member] |
Finite-lived Intangible Assets, Renewal Period (Year) | 1 year
Maximum [Member] |
Finite-lived Intangible Assets, Renewal Period (Year) | 3 years

X
- Definition 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. + References No definition available. + Details
Name: | eth_FinitelivedIntangibleAssetsRenewalPeriod
Namespace Prefix: | eth_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_ComputerSoftwareIntangibleAssetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |