XML 17 R6.htm IDEA: XBRL DOCUMENT v3.10.0.1

CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (PARENTHETICAL) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Stockholders' Equity [Abstract]
Dividends declared (in dollars per share)	$ 0.37	$ 0.40	$ 1.11	$ 1.20
Underwriters' discount			$ 0.0	$ 1.9
Third Party Agent Commissions and Fees			$ 0.0	$ 0.2

X

- Definition

Commissions and fees paid to a third party agent in connection with the issuance of common shares under the Company's at-the-market program.

+ References

No definition available.

+ Details

Name:	earn_ThirdPartyAgentCommissionsandFees
Namespace Prefix:	earn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Commission paid to the underwriters for the sale of shares.

+ References

No definition available.

+ Details

Name:	earn_Underwritersdiscount
Namespace Prefix:	earn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration