Note 7 - Foreclosed Assets - Schedule of Expenses Applicable to Foreclosed Assets (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Write-down on real estate owned and other repossessed assets	$ (28)	$ (45)
Net loss on sale of real estate owned and other repossessed property	(54)	(29)
Operating expenses net of rental income	(55)	(62)
Expenses related to foreclosed assets, net	$ (137)	$ (136)

Represents the operating expense net of rental income on foreclosed real estate.

No definition available.

Name:	ebmt_ForeclosedRealEstateOperatingExpenseNetOfRentalIncome
Namespace Prefix:	ebmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of write-down on real estate owned and other repossessed property.

+ References

No definition available.

+ Details

Name:	ebmt_WritedownOnRealEstateOwnedAndOtherRepossessedProperty
Namespace Prefix:	ebmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of expense recognized during the period for the foreclosure on real estate assets.

+ References

No definition available.

+ Details

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

- Definition

The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.14(d))
-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration