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Organization and Investment Objective (Details) | 9 Months Ended
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Sep. 30, 2018
Organization and Investment Objective [Line Items] |
Required Distribution of Taxable Net Income, Percentage on Annual Basis | 90.00%
Intended Distribution of Taxable Net Income, Percentage on Annual Basis | 100.00%

X
- Definition Percentage of taxable income the Company intends to distribute on an annual basis. + References No definition available. + Details
Name: | earn_IntendedDistributionofTaxableNetIncomePercentageonAnnualBasis
Namespace Prefix: | earn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition [Line Items] for Organization and Investment Objective [Table] + References No definition available. + Details
Name: | earn_OrganizationandInvestmentObjectiveLineItems
Namespace Prefix: | earn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of taxable income the Company is required to distribute on an annual basis. + References No definition available. + Details
Name: | earn_RequiredDistributionofTaxableNetIncomePercentageonAnnualBasis
Namespace Prefix: | earn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration