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v3.23.3

Note 2 - Revenue 1 (Details Textual) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 | Jun. 30, 2022 | Sep. 30, 2023 USD ($) | Sep. 30, 2022 | Dec. 31, 2022 USD ($)
Revenue from Contract with Customers, Sales Returns, Percent |  |  | 1.00% | 1.00% |  |
Contract with Customer, Liability | $ 4.5 |  |  | $ 4.5 |  | $ 3.8
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |  |
Number of Major Markets | 0 | 0 |  | 0 | 0 |
Number of Major Customers | 0 | 0 |  | 0 | 0 |
Minimum [Member] |  |  |  |  |  |
Revenue from Contract with Customer, Sales Returns Policy Term (Day) |  |  |  | 14 days |  |
Revenue from Contract with Customers, Historical Sales Returns, Percent |  |  |  | 1.00% |  |
Maximum [Member] |  |  |  |  |  |
Revenue from Contract with Customer, Sales Returns Policy Term (Day) |  |  |  | 1 year |  |
Revenue from Contract with Customers, Historical Sales Returns, Percent |  |  |  | 4.00% |  |

X
- Definition Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc. + References No definition available. + Details
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Namespace Prefix: | nhtc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of major markets accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc. + References No definition available. + Details
Name: | nhtc_NumberOfMajorMarkets
Namespace Prefix: | nhtc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the sales returns policy term. + References No definition available. + Details
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Namespace Prefix: | nhtc_
Data Type: | xbrli:durationItemType
Balance Type: | na
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X
- Definition Represents the percentage of historical sales returns. + References No definition available. + Details
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X
- Definition Represents the percentage of sales returns. + References No definition available. + Details
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X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-2 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
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Balance Type: |
Period Type: |

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- Details
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Period Type: |

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