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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (DETAILS TEXTUAL)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Loans Receivable Percentage	62.20%	81.30%
Accounts Receivable [Member]
Accounts Receivable Percentage	62.00%	81.00%	62.00%
Loans Receivable Percentage	100.00%
Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life	10 years
Maximum [Member] | Other Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life	5 years
Minimum [Member] | Other Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life	2 years

X

- Definition

Percentage of accounts receivable during the period.

+ References

No definition available.

+ Details

Name:	hiho_AccountsReceivablePercentage
Namespace Prefix:	hiho_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of loans receivable during the period.

+ References

No definition available.

+ Details

Name:	hiho_LoansReceivablePercentage
Namespace Prefix:	hiho_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration