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v3.21.2

Note 2 - Revenue (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Revenue from Contract with Customers, Sales Returns, Percent |  |  | 1.00% |
Increase (Decrease) in Contract with Customer, Liability | $ 4,000 |  | $ 2,973 | $ (1,045)
Contract with Customer, Liability, Revenue Recognized | $ 1,000 |  |  |
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |
Number of Major Markets | 0 | 0 | 0 | 0
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |
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 |  |  | 8.00% |

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
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X
- Definition Represents the sales returns policy term. + References No definition available. + Details
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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
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- 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 http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 + Details
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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 http://asc.fasb.org/extlink&oid=123570139&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 http://asc.fasb.org/extlink&oid=123371682&loc=d3e55415-109406 + Details
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- Details
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Data Type: | na
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