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Note 10 - Fair Value of Financial Instruments - Financial Assets and Liabilities, Valuation Techniques and Significant Unobservable Inputs (Details) | Mar. 31, 2026
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Minimum [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member] |
Collateral-dependent loans individually evaluated | 0.10
Real estate and other repossessed assets, input | 0.10
Minimum [Member] | Valuation, Income Approach [Member] | Measurement Input, Pull-through Expectations [Member] |
Interest rate lock commitments, input | 0.85
Maximum [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member] |
Collateral-dependent loans individually evaluated | 0.30
Real estate and other repossessed assets, input | 0.30
Maximum [Member] | Valuation, Income Approach [Member] | Measurement Input, Pull-through Expectations [Member] |
Interest rate lock commitments, input | 0.96

X
- Definition Value of input used to measure impaired loans. + References No definition available. + Details
Name: | ebmt_ImpairedLoansMeasurementInput
Namespace Prefix: | ebmt_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Value of input used to measure repossessed assets. + References No definition available. + Details
Name: | ebmt_RepossessedAssetsMeasurementInput
Namespace Prefix: | ebmt_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Value of input used to measure derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_DerivativeAssetMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_MarketApproachValuationTechniqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_IncomeApproachValuationTechniqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=ebmt_MeasurementInputPullThroughExpectationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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