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Note 5 - Contingencies (Details Textual)
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Mar. 31, 2015
USD ($)
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Dec. 31, 2014
USD ($)
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Mar. 31, 2015
Korean Business Segment [Member]
USD ($)
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Mar. 31, 2015
Korean Business Segment [Member]
KRW
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|---|---|---|---|---|
| Other Assets, Noncurrent | $ 591,000us-gaap_OtherAssetsNoncurrent | $ 372,000us-gaap_OtherAssetsNoncurrent |
$ 178,000us-gaap_OtherAssetsNoncurrent / us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis = nhtc_KoreanBusinessSegmentMember |
197,000,000us-gaap_OtherAssetsNoncurrent / us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis = nhtc_KoreanBusinessSegmentMember |
| 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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