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Note 3 - Loans Receivable - Schedule of Financing Receivable Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Modified, Amortized cost	$ 156	$ 506
Modified, Number	1	4
Payment Deferral and Extended Maturity [Member]
Modified, Amortized cost	$ 156	$ 297
Total Financing Receivables, Percentage
Extended Maturity and Interest Rate Reduction [Member]
Modified, Amortized cost	$ 0	$ 209
Total Financing Receivables, Percentage
Commercial Portfolio Segment [Member] | Agricultural Loan [Member]
Modified, Amortized cost	$ 156	$ 252
Modified, Number	1	2
Commercial Portfolio Segment [Member] | Agricultural Loan [Member] | Payment Deferral and Extended Maturity [Member]
Modified, Amortized cost	$ 156	$ 252
Total Financing Receivables, Percentage	0.13%	0.19%
Commercial Portfolio Segment [Member] | Agricultural Loan [Member] | Extended Maturity and Interest Rate Reduction [Member]
Modified, Amortized cost	$ 0	$ 0
Total Financing Receivables, Percentage	0.00%	0.00%
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Modified, Amortized cost		$ 209
Modified, Number		1
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Payment Deferral and Extended Maturity [Member]
Modified, Amortized cost		$ 0
Total Financing Receivables, Percentage		0.00%
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Extended Maturity and Interest Rate Reduction [Member]
Modified, Amortized cost		$ 209
Total Financing Receivables, Percentage		0.03%
Home Equity Portfolio Segment [Member]
Modified, Amortized cost		$ 45
Modified, Number		1
Home Equity Portfolio Segment [Member] | Payment Deferral and Extended Maturity [Member]
Modified, Amortized cost		$ 45
Total Financing Receivables, Percentage		0.04%
Home Equity Portfolio Segment [Member] | Extended Maturity and Interest Rate Reduction [Member]
Modified, Amortized cost		$ 0
Total Financing Receivables, Percentage		0.00%

X

- Definition

The number of financing receivable, excluding accrued interest, of modified during period for debtor experiencing financial difficulty.

+ References

No definition available.

+ Details

Name:	ebmt_FinancingReceivableExcludingAccruedInterestModifiedInPeriodNumber
Namespace Prefix:	ebmt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage, excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

+ Details

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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
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X

- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
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