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Note 8- Related Party Transactions (Details Textual) (USD $)
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1 Months Ended |
12 Months Ended |
1 Months Ended |
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Dec. 17, 2014
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Dec. 31, 2014
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Dec. 31, 2013
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Feb. 28, 2013
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Dec. 17, 2014
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Nov. 14, 2014
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| Related Party Transactions [Abstract] |
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| Treasury Stock, Shares, Acquired |
359,840us-gaap_TreasuryStockSharesAcquired
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| Treasury Stock, Value, Acquired, Cost Method |
$ 4,500,000us-gaap_TreasuryStockValueAcquiredCostMethod
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$ 4,661,000us-gaap_TreasuryStockValueAcquiredCostMethod
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$ 52,000us-gaap_TreasuryStockValueAcquiredCostMethod
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| Broady Health Sciences [Member] |
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| Related Party Transactions [Abstract] |
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| Royalty Rate |
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2.50%nhtc_RoyaltyRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nhtc_BroadyHealthSciencesMember
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| Accrued Royalties |
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144,000us-gaap_AccruedRoyaltiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nhtc_BroadyHealthSciencesMember
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48,000us-gaap_AccruedRoyaltiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nhtc_BroadyHealthSciencesMember
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| Number of Days Termination Notice |
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120 days
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| Broady Health Sciences [Member] | Soothe [Member] |
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| Related Party Transactions [Abstract] |
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| Royalty Rate |
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2.50%nhtc_RoyaltyRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nhtc_BroadyHealthSciencesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nhtc_SootheMember
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| Accrued Royalties |
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11,700us-gaap_AccruedRoyaltiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nhtc_BroadyHealthSciencesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nhtc_SootheMember
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| George K. Broady [Member] |
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| Related Party Transactions [Abstract] |
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| Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |
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5.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nhtc_GeorgeKBroadyMember
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| Treasury Stock, Shares, Acquired |
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119,947us-gaap_TreasuryStockSharesAcquired
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nhtc_GeorgeKBroadyMember
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| Treasury Stock, Value, Acquired, Cost Method |
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$ 1,500,000us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nhtc_GeorgeKBroadyMember
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| George Broady Member |
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| Related Party Transactions [Abstract] |
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| Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |
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5.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_CounterpartyNameAxis
= nhtc_GeorgeBroadyMember
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