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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
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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

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

X

- Details

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

X

- 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:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
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Balance Type:
Period Type: