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v3.21.2

Related Party Transactions (Details) - USD ($) |  | 8 Months Ended
--- | --- | ---
Jan. 01, 2020 | Dec. 31, 2019
Stephen P. Mandracchia |  |
Related Party Transaction [Line Items] |  |
Monthly consulting fee | $ 12,000 | $ 10,000

X
- Definition Amount the company pays as a consulting fee. + References No definition available. + Details
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Namespace Prefix: | hdsn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_TitleOfIndividualAxis=srt_VicePresidentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |