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Note 18 - Subsequent Event (Details Textual) - Revolving Credit Facility [Member] - The Facility [Member] - USD ($) $ in Millions | Jan. 26, 2022 | Dec. 21, 2018
--- | --- | ---
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 165.0
Debt Instrument, Covenant, Minimum Fixed Charge Coverage Ratio |  | 1,000,000.0
Debt Covenant, Fixed Charge Coverage Ratio, Maximum Unused Availability |  | $ 18.5
Additional Margin on Variable Rate Option (Adjusted Term Sofr Rate) [Member] | Minimum [Member] |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.50%
Additional Margin on Variable Rate Option (Adjusted Term Sofr Rate) [Member] | Maximum [Member] |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.00%
Fed Funds Effective Rate Overnight Index Swap Rate [Member] |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.50%
Subsequent Event [Member] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 125.0 |
Debt Instrument, Covenant, Minimum Fixed Charge Coverage Ratio | 1.0 |
Debt Covenant, Fixed Charge Coverage Ratio, Maximum Unused Availability | $ 14.0 |
Subsequent Event [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 0.10% |
Subsequent Event [Member] | Additional Margin on Variable Rate Option (Adjusted Term Sofr Rate) [Member] | Minimum [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 1.25% |
Subsequent Event [Member] | Additional Margin on Variable Rate Option (Adjusted Term Sofr Rate) [Member] | Maximum [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 2.00% |
Subsequent Event [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 0.50% |
Subsequent Event [Member] | OneMonthAdjusted Term SOFR Rate [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 1.00% |
Subsequent Event [Member] | OneMonthAdditionalMarginOnVariableRateOptionMember | Minimum [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 0.25% |
Subsequent Event [Member] | OneMonthAdditionalMarginOnVariableRateOptionMember | Maximum [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 1.00% |

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- Definition The maximum amount of unused availability under the credit facility that may be held before the fixed charge coverage ratio will apply. + References No definition available. + Details
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Namespace Prefix: | eth_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The fixed charge coverage ratio required by the debt agreement. + References No definition available. + Details
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Namespace Prefix: | eth_
Data Type: | xbrli:pureItemType
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Details
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- Details
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- Details
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- Details
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