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Note 6 - Income Taxes (Details Textual) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2014
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|---|---|
| Income Tax Disclosure [Abstract] | |
| Operating Loss Carryforwards | $ 27.2us-gaap_OperatingLossCarryforwards |
| Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 3.4us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration |
| China [Member] | |
| Income Tax Disclosure [Abstract] | |
| Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration |
$ 2.0us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_StatementGeographicalAxis = nhtc_ChinaMember |
| X | ||||||||||
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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