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Other income (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Aug. 31, 2019 | Jun. 30, 2019
Other income |  |
Cash received from settlement of a working capital adjustment dispute | $ 8.9 |
Other income relating to a change in estimate of its cylinder deposit liability account |  | $ 0.5

X
- Definition The amount of cash received from settlement of a working capital adjustment dispute, classified as other income. + References No definition available. + Details
Name: | hdsn_CashReceivedFromSettlementOfWorkingCapitalAdjustmentDispute
Namespace Prefix: | hdsn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The income relating to a change in estimate of its cylinder deposit liability account, classified as other income. + References No definition available. + Details
Name: | hdsn_OtherIncomeRelatingToChangeInEstimateOfItsCylinderDepositLiabilityAccount
Namespace Prefix: | hdsn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OtherIncomeAndExpensesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration