XML 49 R39.htm IDEA: XBRL DOCUMENT v3.8.0.1

SUBSEQUENT EVENT - NARRATIVE (Details) - $ / shares		3 Months Ended
	Apr. 17, 2018	Mar. 31, 2018	Mar. 31, 2017
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared		$ 0.13	$ 0.44
Subsequent Event
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.14
CommonStockSpecialDividendsPerShareDeclared	$ 1.76

X

- Definition

Special dividends declared during the period for each share of common stock outstanding.

+ References

No definition available.

+ Details

Name:	nhtc_CommonStockSpecialDividendsPerShareDeclared
Namespace Prefix:	nhtc_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: