XML 47 R33.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Stockholders' Equity - Dividend Activity (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 24, 2017 | Aug. 31, 2017 | May 19, 2017 | Mar. 03, 2017 | Nov. 25, 2016 | Aug. 26, 2016 | May 20, 2016 | Mar. 24, 2016 | Nov. 20, 2015 | Aug. 28, 2015 | May 29, 2015 | Mar. 27, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Per Share, Common (in dollars per share) | $ 0.12 | $ 0.11 | $ 0.10 | $ 0.09 | $ 0.08 | $ 0.07 | $ 0.06 | $ 0.05 | $ 0.05 | $ 0.04 | $ 0.03 | $ 0.02 | $ 1.52 | $ 0.61 | $ 0.14
CommonStockSpecialDividendsPerShareDeclared | $ 0.15 | $ 0.25 | $ 0.35 | $ 0.35 | $ 0.35 |  |  |  |  |  |  |  |  |  |
Dividends, cash | $ 1,360,000 | $ 1,246,000 | $ 1,133,000 | $ 1,019,000 | $ 901,000 | $ 787,000 | $ 686,000 | $ 576,000 | $ 598,000 | $ 489,000 | $ 372,000 | $ 250,000 | $ 17,218,000 | $ 6,891,000 | $ 1,709,000
Payment Date | Nov. 24, 2017 | Aug. 31, 2017 | May 19, 2017 | Mar. 03, 2017 | Nov. 25, 2016 | Aug. 26, 2016 | May 20, 2016 | Mar. 24, 2016 | Nov. 20, 2015 | Aug. 28, 2015 | May 29, 2015 | Mar. 27, 2015 |  |  |
Dividends, Common Stock, Cash | $ 1,701,000 | $ 2,833,000 | $ 3,964,000 | $ 3,962,000 | $ 3,941,000 |  |  |  |  |  |  |  |  |  |

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 paid 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_CommonStockDividendsPerShareCashPaid
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
Name: | us-gaap_DividendPayableDateToBePaidDayMonthAndYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of paid and unpaid cash dividends declared for classes of stock, for example, but not limited to, common and preferred. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
Name: | us-gaap_DividendsCash
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + 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_DividendsCommonStockCash
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_StockholdersEquityNoteAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration