Note 12 - Income Taxes (Details Textual)	84 Months Ended
Oct. 31, 2019 USD ($)
Tax Credit Carryforward, Amount Used in Tax Credit Period	$ 2,964,000
Tax Exemption Period	7 years

Represents the tax credit carryforward amount used in tax credit period.

No definition available.

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