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Staff Retirement Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Staff Retirement Plans (Details Textual)
Employer matching contribution percent	5.00%
Cost of contribution to the staff retirement plans	$ 114	$ 242	$ 227
Hong Kong [Member]
Staff Retirement Plans (Details Textual)
Mandatory provident fund, description	The MPF is available to all employees aged 18 to 64 with at least 60 days of service under the employment of the Group in Hong Kong.

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- Definition

Description of mandatory provident fund.

+ References

No definition available.

+ Details

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Namespace Prefix:	hiho_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	hiho_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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Balance Type:	debit
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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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- Details

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