Note 5 - Contingencies (Details Textual) - Jun. 30, 2015 ₩ in Millions	KRW (₩)	USD ($)
Other Noncurrent Assets [Member]
Distributor Claims Reserve	₩ 223	$ 198,000

Represents the funds which can be utilized to fund any outstanding distributor claims for product returns.

No definition available.

Name:	nhtc_DistributorClaimsReserve
Namespace Prefix:	nhtc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant