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v3.22.4

Note 2 - Revenue (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Revenue from Contract with Customers, Sales Returns, Percent | 1.00% | 1.00%
Contract with Customer, Liability, Revenue Recognized | $ (6.5) |
Increase (Decrease) in Contract with Customer, Liability | $ (3.8) |
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 | 5.00% |

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
Period Type: | duration

X
- Definition Represents the percentage of historical sales returns. + References No definition available. + Details
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Namespace Prefix: | nhtc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of sales returns. + References No definition available. + Details
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Namespace Prefix: | nhtc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 310 -Section 45 -Paragraph 11 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126938201&loc=d3e55415-109406 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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