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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