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Off - Balance Sheet Exposures (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jan. 31, 2021	Oct. 31, 2020	Mar. 31, 2022
Off - Balance Sheet Exposures [Abstract]
Credit facility amount	$ 1,000	$ 1,000
Percentage of the common stock of the customer			10.00%
Credit facility and the amount was reflected in accounts receivable			$ 699
Off-balance sheet exposure of credit facility			301
Utilized credit facility amount			18
Unutilized credit facility amount			$ 8

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- References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Unutilized Revolving Loan Commitment means, with respect to any Lender at any time, such Lender's Revolving Loan Commitment at such time less the sum of (i) the aggregate outstanding principal amount of all Revolving Loans made by such Lender at such time and (ii) such Lender's RL Percentage of the Letter of Credit.

+ References

No definition available.

+ Details

Name:	hiho_UnutilizedCreditFacilityAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

A credit facility is a type of loan made in a business or corporate finance context. It allows the borrowing business to take out money over an extended period of time rather than reapplying for a loan each time it needs money.

+ References

No definition available.

+ Details

Name:	hiho_UtilizedCreditFacilityAmount
Namespace Prefix:	hiho_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Amount of the total principal payments made during the annual reporting period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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

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- Definition

Amount of the required periodic payments of both interest and principal.

+ 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 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

X

- Definition

Amount of the required periodic payment applied to principal.

+ 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 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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

X

- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
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