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Significant Accounting Policies (Details) | 9 Months Ended
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Sep. 30, 2018
Significant Accounting Policies [Line Items] |
Required Distribution of Taxable Net Income, Percentage on Annual Basis | 90.00%
Minimum [Member] |
Significant Accounting Policies [Line Items] |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 1 year
Maximum [Member] |
Significant Accounting Policies [Line Items] |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 2 years

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- Definition Percentage of taxable income the Company is required to distribute on an annual basis. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition [Line Items] for Significant Accounting Policies [Table] + References No definition available. + Details
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Namespace Prefix: | earn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Details
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- Details
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