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Note 3 - Commitments and Contingencies (Details Textual)
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1 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2014
USD ($)
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Apr. 21, 2013
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Apr. 21, 2009
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Dec. 31, 2014
USD ($)
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Dec. 31, 2013
USD ($)
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Oct. 31, 2007
USD ($)
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Oct. 19, 2007
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Nov. 18, 2007
Five Year Warrants [Member]
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Oct. 31, 2007
One Year Warrants [Member]
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Dec. 31, 2007
Seven Year Warrants [Member]
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Dec. 31, 2014
Korean Business Segment [Member]
USD ($)
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Dec. 31, 2014
Korean Business Segment [Member]
KRW
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| Commitments and Contingencies Disclosure [Abstract] | ||||||||||||
| Operating Leases, Rent Expense | $ 777,000us-gaap_LeaseAndRentalExpense | $ 787,000us-gaap_LeaseAndRentalExpense | ||||||||||
| Purchase Commitment, Monthly Amount, Minimum | 40,000nhtc_PurchaseCommitmentMonthlyAmountMinimum | 40,000nhtc_PurchaseCommitmentMonthlyAmountMinimum | ||||||||||
| Purchase Commitment, Remaining Minimum Amount Committed | 3,300,000us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted | 3,300,000us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted | ||||||||||
| Purchase Commitment, Term | 3 years | |||||||||||
| Purchase Commitment, Renewal Term | 3 years | |||||||||||
| Supplemental Unemployment Benefits, Severance Benefits | 12,000us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits | 12,000us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits | ||||||||||
| Other Assets, Noncurrent | 372,000us-gaap_OtherAssetsNoncurrent | 372,000us-gaap_OtherAssetsNoncurrent | 300,000us-gaap_OtherAssetsNoncurrent |
180,000us-gaap_OtherAssetsNoncurrent / us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis = nhtc_KoreanBusinessSegmentMember |
197,000,000us-gaap_OtherAssetsNoncurrent / us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis = nhtc_KoreanBusinessSegmentMember |
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| Convertible Debt | $ 4,250,000us-gaap_ConvertibleDebt | |||||||||||
| Term Of Warrant | 5 years | 1 year | 7 years | 7 years | 1 year | 7 years | ||||||
| Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 88,097us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights | 88,097us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights | 3,141,499us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |
1,495,952us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_RangeAxis = nhtc_FiveYearWarrantsMember |
1,495,952us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_RangeAxis = nhtc_OneYearWarrantsMember |
1,495,952us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_RangeAxis = nhtc_SevenYearWarrantsMember |
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| X | ||||||||||
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- Definition
Represents the monthly purchase minimum the Company is required to purchase until the termination date. No definition available.
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| X | ||||||||||
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- Definition
Period of time that a purchase commitment agreement is automatically renewed for after the original term ends unless notice of termination is given by either party to the agreement. No definition available.
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| X | ||||||||||
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- Definition
Period of time that a purchase commitment agreement is in effect. No definition available.
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| X | ||||||||||
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- Definition
Represents the term of the warrant. No definition available.
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| X | ||||||||||
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- Definition
Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. No definition available.
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| X | ||||||||||
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- Definition
Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Liability for amount due employees, in addition to wages and any other money that employers owe employees, when their employment ends through a layoff or other termination. For example, a company may provide involuntarily terminated employees with a lump sum payment equal to one week's salary for every year of employment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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