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CONCENTRATIONS OF CREDIT RISK AND MAJOR CUSTOMERS (DETAILS) | 12 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Concentration Of Credit Risk And Major Customers [Line Items] |  |
Loans Receivable Percentage | 100.00% | 100.00%
Accounts Receivable [Member] |  |
Concentration Of Credit Risk And Major Customers [Line Items] |  |
Loans Receivable Percentage | 54.10% | 62.20%
Accounts Receivable [Member] | Customer A [Member] |  |
Concentration Of Credit Risk And Major Customers [Line Items] |  |
Loans Receivable Percentage | 31.80% | 36.60%
Accounts Receivable [Member] | Customer B [Member] |  |
Concentration Of Credit Risk And Major Customers [Line Items] |  |
Loans Receivable Percentage | 11.60% | 12.40%
Accounts Receivable [Member] | Customer C [Member] |  |
Concentration Of Credit Risk And Major Customers [Line Items] |  |
Loans Receivable Percentage | 0.00% | 13.20%
Accounts Receivable [Member] | Customer D [Member] |  |
Concentration Of Credit Risk And Major Customers [Line Items] |  |
Loans Receivable Percentage | 10.70% | 0.00%

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- Details
Name: | hiho_ConcentrationOfCreditRiskAndMajorCustomersLineItems
Namespace Prefix: | hiho_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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