Stock Rights Plan (Details Narrative) (USD $)	12 Months Ended
Jun. 30, 2014
Stock Rights Plan
Expiration date of the plan	2019-12-31
Number of rights distributed as a dividend, per share of common stock	1
Date purchased rights distributed	Apr. 14, 1989
Number of shares that can be purchased by exercising each stock right	0.50
Exercise price (per share)	$ 25
Beneficial ownership percentage that causes rights to be exercisable	15.00%
Percentage sale of assets or earning power to another person where rights become exercisable	50.00%

The threshold percentage of ownership of the Company's stock that triggers the exercise of stock rights.

No definition available.

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Namespace Prefix:	esp_
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- Definition

Expiration date of the stock rights plan in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	esp_
Data Type:	xbrli:dateTimeItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of common stock purchase rights distributed as a dividend per share of common stock outstanding as of the date of record.

+ References

No definition available.

+ Details

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Namespace Prefix:	esp_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of the Company's assets, or earning power, that are sold to another person that triggers the exercise of stock rights.

+ References

No definition available.

+ Details

Name:	esp_SaleOfAssetsOrEarningPowerToAnotherPersonWhereRightsBecomeExercisablePercentage
Namespace Prefix:	esp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	esp_StockRightsPlanAbstract
Namespace Prefix:	esp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the warrants or rights are exercisable, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(3))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Subparagraph 3

-Article 4

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant