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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, 2023	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			$ 737	$ 699
Off-balance sheet exposure of credit facility			263	301
Utilized credit facility amount			475	28
Unutilized credit facility amount			$ 18	$ 8

X

- References

No definition available.

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X

- 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

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

X

- 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

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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Balance Type:	debit
Period Type:	duration

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

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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
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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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.

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