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Note 10 - Related Party Transactions (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Director [Member] |  |  |  |
Common Stock, Percentage of Beneficial Stock Outstanding | 5.00% |  | 5.00% |
BHS [Member] | Royalty Agreement and License [Member] |  |  |  |
Royalty Expense | $ 11,000 | $ 35,000 | $ 19,000 | $ 50,000
Related Party Transaction, Automatic Renewal Period of Agreement (Year) |  |  |  | 1 year
Number of Days Termination Notice (Day) |  |  |  | 90 days

X
- Definition Represents the percentage of beneficial stock outstanding. + References No definition available. + Details
Name: | nhtc_CommonStockPercentageOfBeneficialStockOutstanding
Namespace Prefix: | nhtc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of days for termination notice. + References No definition available. + Details
Name: | nhtc_NumberOfDaysTerminationNotice
Namespace Prefix: | nhtc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the automatic renewal period of the agreement in related party transaction. + References No definition available. + Details
Name: | nhtc_RelatedPartyTransactionAutomaticRenewalPeriodOfAgreement
Namespace Prefix: | nhtc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
Name: | us-gaap_RoyaltyExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_DirectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=nhtc_BHSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=nhtc_RoyaltyAgreementAndLicenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |