Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000912061-20-000014-index-headers.html | 2020-03-09 16:52:34 | |
| 0000912061-20-000014-index.html | 2020-03-09 16:52:34 | |
| 0000912061-20-000014.txt | 2020-03-09 16:52:34 | |
 0000912061-20-000014-xbrl.zip | 332563 | 2020-03-09 16:52:34 |
| FilingSummary.xml | 37461 | 2020-03-09 16:52:34 |
| Financial_Report.xlsx | 86222 | 2020-03-09 16:52:34 |
| MetaLinks.json | 632211 | 2020-03-09 16:52:34 |
| nhtc-20191231.xsd | 48760 | 2020-03-09 16:52:34 |
| nhtc-20191231_cal.xml | 103784 | 2020-03-09 16:52:34 |
| nhtc-20191231_def.xml | 233880 | 2020-03-09 16:52:34 |
| nhtc-20191231_lab.xml | 719898 | 2020-03-09 16:52:34 |
| nhtc-20191231_pre.xml | 420240 | 2020-03-09 16:52:34 |
| nhtc2019123110k.htm | 1669568 | 2020-03-09 16:52:34 |
| nhtc2019123110k_htm.xml | 1259656 | 2020-03-09 16:52:34 |
| q42019ex10-4.htm | 33274 | 2020-03-09 16:52:34 |
| q42019ex10-5.htm | 34672 | 2020-03-09 16:52:34 |
| q42019ex21-1.htm | 20196 | 2020-03-09 16:52:34 |
| q42019ex3-2.htm | 98437 | 2020-03-09 16:52:34 |
 q42019ex3-2001.jpg | 40340 | 2020-03-09 16:52:34 |
 q42019ex3-2002.jpg | 196075 | 2020-03-09 16:52:34 |
 q42019ex3-2003.jpg | 205494 | 2020-03-09 16:52:34 |
 q42019ex3-2004.jpg | 49772 | 2020-03-09 16:52:34 |
 q42019ex3-2005.jpg | 251718 | 2020-03-09 16:52:34 |
 q42019ex3-2006.jpg | 312932 | 2020-03-09 16:52:34 |
 q42019ex3-2007.jpg | 326910 | 2020-03-09 16:52:34 |
 q42019ex3-2008.jpg | 322785 | 2020-03-09 16:52:34 |
 q42019ex3-2009.jpg | 313434 | 2020-03-09 16:52:34 |
 q42019ex3-2010.jpg | 272590 | 2020-03-09 16:52:34 |
 q42019ex3-2011.jpg | 280337 | 2020-03-09 16:52:34 |
 q42019ex3-2012.jpg | 259132 | 2020-03-09 16:52:34 |
 q42019ex3-2013.jpg | 329791 | 2020-03-09 16:52:34 |
 q42019ex3-2014.jpg | 265104 | 2020-03-09 16:52:34 |
 q42019ex3-2015.jpg | 265254 | 2020-03-09 16:52:34 |
 q42019ex3-2016.jpg | 329698 | 2020-03-09 16:52:34 |
 q42019ex3-2017.jpg | 282275 | 2020-03-09 16:52:34 |
 q42019ex3-2018.jpg | 321747 | 2020-03-09 16:52:34 |
 q42019ex3-2019.jpg | 312925 | 2020-03-09 16:52:34 |
 q42019ex3-2020.jpg | 274398 | 2020-03-09 16:52:34 |
 q42019ex3-2021.jpg | 290558 | 2020-03-09 16:52:34 |
 q42019ex3-2022.jpg | 261752 | 2020-03-09 16:52:34 |
 q42019ex3-2023.jpg | 252256 | 2020-03-09 16:52:34 |
 q42019ex3-2024.jpg | 77868 | 2020-03-09 16:52:34 |
 q42019ex3-2025.jpg | 57213 | 2020-03-09 16:52:34 |
| q42019ex31-1.htm | 12403 | 2020-03-09 16:52:34 |
| q42019ex31-2.htm | 12473 | 2020-03-09 16:52:34 |
| q42019ex32-1.htm | 12955 | 2020-03-09 16:52:34 |
| q42019ex4-2.htm | 15672 | 2020-03-09 16:52:34 |
| R1.htm | 62721 | 2020-03-09 16:52:34 |
| R10.htm | 12924 | 2020-03-09 16:52:34 |
| R11.htm | 33329 | 2020-03-09 16:52:34 |
| R12.htm | 53778 | 2020-03-09 16:52:34 |
| R13.htm | 39046 | 2020-03-09 16:52:34 |
| R14.htm | 28794 | 2020-03-09 16:52:34 |
| R15.htm | 22523 | 2020-03-09 16:52:34 |
| R16.htm | 8881 | 2020-03-09 16:52:34 |
| R17.htm | 72698 | 2020-03-09 16:52:34 |
| R18.htm | 81309 | 2020-03-09 16:52:34 |
| R19.htm | 10893 | 2020-03-09 16:52:34 |
| R2.htm | 84771 | 2020-03-09 16:52:34 |
| R20.htm | 6893 | 2020-03-09 16:52:34 |
| R21.htm | 69945 | 2020-03-09 16:52:34 |
| R22.htm | 7392 | 2020-03-09 16:52:34 |
| R23.htm | 97305 | 2020-03-09 16:52:34 |
| R24.htm | 33119 | 2020-03-09 16:52:34 |
| R25.htm | 53047 | 2020-03-09 16:52:34 |
| R26.htm | 37540 | 2020-03-09 16:52:34 |
| R27.htm | 28439 | 2020-03-09 16:52:34 |
| R28.htm | 20898 | 2020-03-09 16:52:34 |
| R29.htm | 63408 | 2020-03-09 16:52:34 |
| R3.htm | 19119 | 2020-03-09 16:52:34 |
| R30.htm | 83752 | 2020-03-09 16:52:34 |
| R31.htm | 75483 | 2020-03-09 16:52:34 |
| R32.htm | 83425 | 2020-03-09 16:52:34 |
| R33.htm | 15555 | 2020-03-09 16:52:34 |
| R34.htm | 28642 | 2020-03-09 16:52:34 |
| R35.htm | 71179 | 2020-03-09 16:52:34 |
| R36.htm | 22204 | 2020-03-09 16:52:34 |
| R37.htm | 20075 | 2020-03-09 16:52:34 |
| R38.htm | 8773 | 2020-03-09 16:52:34 |
| R39.htm | 6799 | 2020-03-09 16:52:34 |
| R4.htm | 49399 | 2020-03-09 16:52:34 |
| R40.htm | 19609 | 2020-03-09 16:52:34 |
| R41.htm | 19339 | 2020-03-09 16:52:34 |
| R42.htm | 9880 | 2020-03-09 16:52:34 |
| R43.htm | 13005 | 2020-03-09 16:52:34 |
| R44.htm | 8912 | 2020-03-09 16:52:34 |
| R45.htm | 53295 | 2020-03-09 16:52:34 |
| R46.htm | 11680 | 2020-03-09 16:52:34 |
| R47.htm | 22625 | 2020-03-09 16:52:34 |
| R48.htm | 17152 | 2020-03-09 16:52:34 |
| R49.htm | 10115 | 2020-03-09 16:52:34 |
| R5.htm | 16494 | 2020-03-09 16:52:34 |
| R50.htm | 17730 | 2020-03-09 16:52:34 |
| R51.htm | 26815 | 2020-03-09 16:52:34 |
| R52.htm | 14386 | 2020-03-09 16:52:34 |
| R53.htm | 33659 | 2020-03-09 16:52:34 |
| R54.htm | 14048 | 2020-03-09 16:52:34 |
| R55.htm | 48631 | 2020-03-09 16:52:34 |
| R56.htm | 11798 | 2020-03-09 16:52:34 |
| R57.htm | 25652 | 2020-03-09 16:52:34 |
| R58.htm | 24973 | 2020-03-09 16:52:34 |
| R59.htm | 10993 | 2020-03-09 16:52:34 |
| R6.htm | 44511 | 2020-03-09 16:52:34 |
| R60.htm | 12519 | 2020-03-09 16:52:34 |
| R61.htm | 13668 | 2020-03-09 16:52:34 |
| R7.htm | 4484 | 2020-03-09 16:52:34 |
| R8.htm | 74169 | 2020-03-09 16:52:34 |
| R9.htm | 49844 | 2020-03-09 16:52:34 |
| report.css | 2768 | 2020-03-09 16:52:34 |
| Show.js | 1085 | 2020-03-09 16:52:34 |