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Contracts in Process (Narrative) (Details) - USD ($) | Jun. 30, 2020 | Jun. 30, 2019
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Contractors [Abstract] |  |
Costs relating to contracts that may not be completed within the next year | $ 1,716,176 | $ 2,740,804

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- Definition Costs related to contracts that may not be completed within the next year or operating cycle. + References No definition available. + Details
Name: | esp_NoncurrentCostsInExcessOfBillings
Namespace Prefix: | esp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ContractorsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration