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Note 18 - Employee Retirement Programs (Details Textual) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  | 100.00% |  |
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage | 100.00% |  |  |
Defined Contribution Plan, Employers Matching Contribution, Vesting Period (Year) | 3 years |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount |  | $ 2.7 | $ 3.2 | $ 3.3

X
- Definition The period for vesting of employer's matching contributions to a defined contribution plan. + References No definition available. + Details
Name: | eth_DefinedContributionPlanEmployersMatchingContributionVestingPeriod
Namespace Prefix: | eth_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration