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Related Party Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Related Party Transactions [Abstract] |  |  |  |
Management Fee, Description |  |  | The Manager receives an annual management fee in an amount equal to 1.50% per annum of shareholders' equity (as defined in the Management Agreement) as of the end of each fiscal quarter (before deductions for any management fee with respect to such fiscal period). The management fee is payable quarterly in arrears. |
Management agreement renewal period |  |  | 1 year |
Annual Base Management Fee, Percent | 1.50% |  | 1.50% |
Management fees to affiliate | $ 641 | $ 741 | $ 1,968 | $ 1,953
Expense reimbursement period |  |  | 60 days |
Expenses Reimbursed to Related Party |  |  | $ 1,800 | $ 1,600
Termination fee percentage |  |  | 5.00% |
Termination Fee, Description |  |  | The Management Agreement requires the Company to pay a termination fee to the Manager in the event of (1) the Company's termination or non-renewal of the Management Agreement without cause or (2) the Manager's termination of the Management Agreement upon a default by the Company in the performance of any material term of the Management Agreement. Such termination fee will be equal to 5% of Shareholders' Equity, as defined in the Management Agreement as of the month-end preceding the date of the notice of termination or non-renewal of the Management Agreement. |

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- 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

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- Definition Amount paid by the Company during the period to the Manager to reimburse for expenses paid by the Manager on behalf of the Company. + References No definition available. + Details
Name: | earn_ExpensesReimbursedtoRelatedParty
Namespace Prefix: | earn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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

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- 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_
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- 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
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Namespace Prefix: | earn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Description of payments to managing member for termination or non-renewal of management agreement. Includes events of termination and basis for calculation. + References No definition available. + Details
Name: | earn_TerminationFeeDescription
Namespace Prefix: | earn_
Data Type: | xbrli:stringItemType
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- Definition Description of the nature of payments to managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP), including the fee rate, basis of calculation, relevant accounting period, whether the fee is paid to an entity other than the managing member or general partner, or whether the fee is waived. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_ManagementFeeDescription
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- Definition Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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