Name:	evtn_DisbursementsAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Face (par) amount of debt instrument at time of issuance.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Contractual interest rate for funds borrowed, under the debt agreement.

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Date the debt instrument was issued, in YYYY-MM-DD format.

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Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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Name:	us-gaap_DebtInstrumentMaturityDate
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Balance Type:	na
Period Type:	duration

Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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Period Type:	duration

Amount of accrued but unpaid interest on deposit liabilities.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

No definition available.

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Namespace Prefix:	us-gaap_
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Period Type:	instant

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Name:	us-gaap_DebtInstrumentAxis=evtn_EconomicInjuryDisasterLoanMember
Namespace Prefix:
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Name:	us-gaap_TypeOfArrangementAxis=evtn_AgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	srt_ConsolidatedEntitiesAxis=srt_SubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	dei_LegalEntityAxis=evtn_BankOfAmericaNAMember
Namespace Prefix:
Data Type:	na
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