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Related Party Transactions (Details)	3 Months Ended
	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