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Management Fees (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2013
Management Fees Disclosure [Abstract] |  |  |
Annual base management fee percentage |  | 1.50% | 1.50%
Management fees | $ 8 | $ 644 | $ 1,466

X
- Definition Percentage used to calculate fees paid to the Manager as per the Managment Agreement. + References No definition available. + Details
Name: | earn_AnnualBaseManagementFeePercent
Namespace Prefix: | earn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the expense incurred during the period relating to fees paid to the Manager. + References No definition available. + Details
Name: | earn_ManagementFees
Namespace Prefix: | earn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | earn_ManagementFeesDisclosureAbstract
Namespace Prefix: | earn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration