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Leases (Details Textual) - USD ($) $ in Thousands | 1 Months Ended |
--- | --- | ---
Mar. 29, 2019 | Mar. 31, 2020
Leases (Textual) |  |
Lease, description | Kayser Myanmar entered into a 50-year lease of a manufacturing facility in Yangon, Myanmar. Kayser Myanmar is obligated under the lease to make monthly lease payment equal to 10 million Myanmar Kyat (equivalent to $7.2 per month as of March 31, 2020). At inception, Kayser Myanmar has paid $950 as prepaid rent under the lease, approximately 12 years of rental payments. |
Operating lease cost government subsidy and sublease income |  | $ 289

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- Definition Description on lease. + References No definition available. + Details
Name: | hiho_LeaseDescription
Namespace Prefix: | hiho_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | hiho_LeaseTextualAbstract
Namespace Prefix: | hiho_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Operating lease cost government subsidy. + References No definition available. + Details
Name: | hiho_OperatingLeaseCostGovernmentSubsidy
Namespace Prefix: | hiho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant