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Contracts in Process (Schedule of Contracts in Process) (Details) - USD ($) | Jun. 30, 2021 | Jun. 30, 2020
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Contractors [Abstract] |  |
Unrecognized gross contract value | $ 65,647,715 | $ 54,929,249
Costs related to contracts in process | $ 16,354,636 | $ 12,115,756

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- Definition Unrecognized gross contract value. + References No definition available. + Details
Name: | esp_UnrecognizedGrossContractValue
Namespace Prefix: | esp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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

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- Definition Amount before valuation and LIFO reserves, and progress payments, of inventory associated with long-term contracts, expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a),(d)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_InventoryForLongTermContractsOrPrograms
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant