Management fee.

No definition available.

Name:	HET_ManagementFee
Namespace Prefix:	HET_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

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+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

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-Topic 210
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of interest payable on debt, including, but not limited to, trade payables.

+ References

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-Name Accounting Standards Codification
-Topic 942
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Number of new stock issued during the period.

+ References

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

- Definition

Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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-Publisher FASB
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	srt_TitleOfIndividualAxis=HET_PresidentAndCEOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=srt_ChiefFinancialOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=HET_GeneralManagerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=HET_SmartenCoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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RELATED PARTIES (Details Narrative)	3 Months Ended		12 Months Ended
RELATED PARTIES (Details Narrative)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($) shares	Dec. 31, 2021 USD ($)	Mar. 31, 2022 CNY (¥)	Dec. 31, 2021 CNY (¥)	Sep. 30, 2020	Jul. 31, 2020 USD ($)	Jul. 31, 2020 CNY (¥)
Related Party Transaction [Line Items]
Professional fees	$ 67,373	$ 46,886
Cash payment	53,799		$ 119,357
Settle of unpaid cash		20,000
Principle amount renewed			$ 58,929		¥ 374,500
Interest rate						18.00%	18.00%	18.00%
Debt maturity date			Dec. 31, 2022
President and CEO [Member]
Related Party Transaction [Line Items]
Management fee	18,000	18,000
Principle amount renewed							$ 55,830	¥ 364,500
Interest rate			100.00%		100.00%
Accrued interest expenses	2,651	2,757
Chief Financial Officer [Member]
Related Party Transaction [Line Items]
Professional fees	12,000	12,000
General Manager [Member] \| Smarten Co [Member]
Related Party Transaction [Line Items]
Cash payment	$ 6,137			¥ 39,000
CEO and CFO [Member] \| Accounts Payable [Member]
Related Party Transaction [Line Items]
Settle of unpaid cash		$ 10,000
Issuance of common stock for private placement, shares \| shares		100,000