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Organization and Investment Objective (Details)	3 Months Ended
	Mar. 31, 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

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Namespace Prefix:	earn_
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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
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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