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Related Party Transactions (Details) | 3 Months Ended
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Mar. 31, 2013
Related Party Transactions [Abstract] |
Management agreement renewal period | 1 year
Expense reimbursement period | 60 days
Termination fee percentage | 5.00%

X
- Definition Number of days in which the Company will reimburse the Manager following the receipt of an expense invoice. + References No definition available. + Details
Name: | earn_RelatedPartyTransactionExpenseReimbursementPeriod
Namespace Prefix: | earn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of years the Management Agreement will be automatically renewed for after the current term has lapsed. + References No definition available. + Details
Name: | earn_RelatedPartyTransactionManagementAgreementRenewalPeriod
Namespace Prefix: | earn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage used to calculated termination fee in the event of the termination of the Management Agreement, as described in the Management Agreement. + References No definition available. + Details
Name: | earn_RelatedPartyTransactionTerminationFeePercentage
Namespace Prefix: | earn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration