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Note 12 - Employee Benefit Plans (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Percentage | 90.00% |
Age Requirement For 401K Contributions (Year) | 21 years |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 4.50% | 4.50%
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage | 100.00% | 100.00%
Defined Contribution Plan, Cost | $ 76,000 | $ 78,000

X
- Definition Represents age requirement for 401 K contributions. + References No definition available. + Details
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Namespace Prefix: | nhtc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Commitment made to pay deferred cash remuneration expressed as a percentage of the individual's base salary. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + Details
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Balance Type: | debit
Period Type: | duration

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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X
- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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