EBITDA Calculation (Details) (USD $)	6 Months Ended
Jun. 30, 2014
EBITDA Calculation [Line Items]
Net income	$ 468,000
add: income tax provision	261,000
Income before income taxes	729,000
add: interest expense	395,000
add: depreciation and amortization	411,000
Earnings before interest, taxes, depreciation, and amortization	$ 1,535,000

Earnings before interest taxes depreciation and amortization.

No definition available.

Name:	hdsn_EarningsBeforeInterestTaxesDepreciationAndAmortization
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Data Type:	xbrli:monetaryItemType
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Earnings before interest taxes depreciation and amortization adjustments.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Earnings before interest taxes depreciation and amortization income loss before income taxes.

No definition available.

Name:	hdsn_EarningsBeforeInterestTaxesDepreciationAndAmortizationIncomeLossBeforeIncomeTaxes
Namespace Prefix:	hdsn_
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Earnings before interest taxes depreciation and amortization income tax expense benefit.

No definition available.

Name:	hdsn_EarningsBeforeInterestTaxesDepreciationAndAmortizationIncomeTaxExpenseBenefit
Namespace Prefix:	hdsn_
Data Type:	xbrli:monetaryItemType
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Earnings before interest taxes depreciation and amortization interest expense.

No definition available.

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Namespace Prefix:	hdsn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Earnings before interest taxes depreciation and amortization net income loss.

No definition available.

Name:	hdsn_EarningsBeforeInterestTaxesDepreciationAndAmortizationNetIncomeLoss
Namespace Prefix:	hdsn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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