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Pension Expense (Details)	12 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016
Retirement Benefits [Abstract]
Defined benefit contributions and expenses	$ 99,031	$ 89,023
Increase in contribution, hourly rate			0.04
Employer matching contibutions of 401(k) plan (percentage)	10.00%	10.00%
Employer matching contributions to 401(k) plan	$ 52,225	$ 49,247

X

- Definition

Amount of contributions which the employer contributes in a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	esp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The hourly increase in pension contributions, per year, based upon the negotiated union contract.

+ References

No definition available.

+ Details

Name:	esp_IncreaseInContributionHourlyRate
Namespace Prefix:	esp_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of cost (reversal of cost) for pension and other postretirement benefits.

+ References

No definition available.

+ Details

Name:	us-gaap_PensionAndOtherPostretirementBenefitExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration