XML 47 R37.htm IDEA: XBRL DOCUMENT
v3.25.2

Note 5 - Leases (Details Textual) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 USD ($) ft² a | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) ft² a | Jun. 30, 2024 USD ($)
Operating Lease, Payments | $ | $ 321,000 | $ 307,000 | $ 630,000 | $ 627,000
Rolling Hills Estates [Member] |  |  |  |
Area of Land (Square Foot) | 4,900 |  | 4,900 |
HONG KONG |  |  |  |
Area of Land (Square Foot) | a | 7,300 |  | 7,300 |
Richmond, British Columbia [Member] |  |  |  |
Area of Land (Square Foot) | 1,600 |  | 1,600 |
Metuchen, New Jersey [Member] |  |  |  |
Area of Land (Square Foot) | 2,000 |  | 2,000 |
CHINA |  |  |  |
Lessee, Number of Branches | 7 |  | 7 |

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

X
- Definition Area of land held. + References No definition available. + Details
Name: | us-gaap_AreaOfLand
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
Name: | us-gaap_OperatingLeasePayments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=nhtc_RollingHillsEstatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_HK
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=nhtc_RichmondBritishColumbiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=nhtc_MetuchenNewJerseyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_CN
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |