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Note 13 - Segment Information - Long-lived Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Total long-lived assets	$ 2,022	$ 2,688
UNITED STATES
Total long-lived assets	1,093	1,425
HONG KONG
Total long-lived assets	325	828
CHINA
Total long-lived assets	281	164
Other Foreign Countries [Member]
Total long-lived assets	$ 323	$ 271

X

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-41

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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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=country_CN
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=nhtc_OtherForeignCountriesMember
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