XML 46 R36.htm IDEA: XBRL DOCUMENT
v3.26.1

Note 5 - Leases (Details Textual) |  | 3 Months Ended
--- | --- | ---
Aug. 31, 2025 USD ($) ft² | Aug. 31, 2025 HKD ($) ft² | Mar. 31, 2026 USD ($) ft² a | Mar. 31, 2025 USD ($)
Sublease Income |  |  | $ 20,000 | $ (0)
Operating Leases, Monthly Payment, Years One Through Three | $ 18,000 | $ 141,500 |  |
Operating Leases, Monthly Payment, Years Four and Five | 19,000 | 149,500 |  |
Operating Leases, Monthly Management Fee | $ 6,000 | $ 43,979 |  |
Operating Lease, Payments |  |  | 291,000 | $ 309,000
Lease in Rolling Hills California and Hong Kong [Member] |  |  |  |
Sublease Income |  |  | $ 20,000 |
Rolling Hills Estates [Member] |  |  |  |
Area of Real Estate Property (Square Foot) | ft² |  |  | 4,900 |
HONG KONG |  |  |  |
Area of Real Estate Property (Square Foot) | 5,300 | 5,300 | 7,300 |
Richmond, British Columbia [Member] |  |  |  |
Area of Real Estate Property (Square Foot) | a |  |  | 1,600 |
Metuchen, New Jersey [Member] |  |  |  |
Area of Real Estate Property (Square Foot) | a |  |  | 2,000 |
CHINA |  |  |  |
Lessee, Number of Branches |  |  | 6 |

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 Amount of monthly management fee. + References No definition available. + Details
Name: | nhtc_OperatingLeasesMonthlyManagementFee
Namespace Prefix: | nhtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of monthly rental payment under operating lease, years four and five. + References No definition available. + Details
Name: | nhtc_OperatingLeasesMonthlyPaymentYearsFourAndFive
Namespace Prefix: | nhtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of monthly rental payment under operating lease, years one through Three. + References No definition available. + Details
Name: | nhtc_OperatingLeasesMonthlyPaymentYearsOneThorughThree
Namespace Prefix: | nhtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Area of a real estate property. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 970 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478979/970-360-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 970 -SubTopic 360 -Name Accounting Standards Codification -Section 30 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478150/970-360-30-2 + Details
Name: | us-gaap_AreaOfRealEstateProperty
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
- Definition Amount of sublease income excluding finance and operating lease expense. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
Name: | us-gaap_SubleaseIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=nhtc_LeaseInRollingHillsCaliforniaAndHongKongMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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: |