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INCOME TAXES NARRATIVE (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
INCOME TAXES [Abstract]
GILTI provisional tax, net of foreign credits	$ 1.0

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- Definition

GILTI provisional tax, net of foreign credits

+ References

No definition available.

+ Details

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Namespace Prefix:	nhtc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

INCOME TAXES [Abstract]

+ References

No definition available.

+ Details

Name:	nhtc_INCOMETAXESAbstract
Namespace Prefix:	nhtc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration