Line of Credit Facility, Additional Borrowing Capacity

No definition available.

Name:	elrc_LineofCreditFacilityAdditionalBorrowingCapacity
Namespace Prefix:	elrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of Credit Facility, Unused Capacity, Commitment Fee Threshold

+ References

No definition available.

+ Details

Name:	elrc_LineofCreditFacilityUnusedCapacityCommitmentFeeThreshold
Namespace Prefix:	elrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Borrowings - Additional Information (Detail) (USD $)					0 Months Ended
Borrowings - Additional Information (Detail) (USD $)	Nov. 19, 2013	Feb. 28, 2014 Credit Agreement	Nov. 19, 2013 Credit Agreement	May 31, 2013 Credit Agreement	Nov. 19, 2013 Credit Agreement J P Morgan Chase Bank	Nov. 19, 2013 Credit Agreement J P Morgan Chase Bank Eurodollar	Nov. 19, 2013 Credit Agreement J P Morgan Chase Bank CB Floating Rate	Nov. 19, 2013 Credit Agreement J P Morgan Chase Bank Adjusted LIBO Rate	Nov. 19, 2013 Maximum Credit Agreement J P Morgan Chase Bank Eurodollar
Line of Credit Facility [Line Items]
Current borrowing capacity under Credit Agreement			$ 50,000,000		$ 25,000,000
Expiration period of Credit Agreement					3 years
Additional borrowing capacity under Credit Agreement	25,000,000
Basis spread on variable rate						0.75%	2.50%	2.00%
Commitment fee percentage on unused capacity						0.10%
Commitment fee threshold on unused capacity									8,000,000.0
Borrowing outstanding		$ 2,025,000		$ 10,000,000
Weighted average interest rate		1.25%		2.34%