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Elements of Deferred Income Tax Assets (Liabilities) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deferred Tax Assets And Liabilities [Line Items] |  |
- Depreciation & amortization | $ (428)hdsn_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDepreciationAndAmortization | $ (542)hdsn_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDepreciationAndAmortization
- Reserves for doubtful accounts | 92 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts | 86 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
- Inventory reserve | 305 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves | 120 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves
- Non qualified stock options | 215 hdsn_DeferredTaxAssetsTaxDeferredExpenseReservesAndNonQualifiedStockOptions | 0 hdsn_DeferredTaxAssetsTaxDeferredExpenseReservesAndNonQualifiedStockOptions
- NOL | 6,244 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 5,906 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Total | $ 6,428 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 5,570 us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Depreciation And Amortization. + References No definition available. + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other reserves not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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