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Note 6 - Leases (Details Textual) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) ft² a
Operating Lease, Payments | $ | $ 1.3
Rolling Hills Estates [Member] |
Area of Land (Square Foot) | 4,900
HONG KONG |
Area of Land (Square Foot) | a | 7,300
Richmond, British Columbia [Member] |
Area of Land (Square Foot) | 1,600
Metuchen, New Jersey [Member] |
Area of Land (Square Foot) | 2,000
CHINA |
Lessee, Number of Branches | 7

X
- Definition Represents the lessees' number of branches. + References No definition available. + Details
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Namespace Prefix: | nhtc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Area of land held. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |