Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001437749-20-003248-index-headers.html | 2020-02-21 12:56:05 | |
| 0001437749-20-003248-index.html | 2020-02-21 12:56:05 | |
| 0001437749-20-003248.txt | 2020-02-21 12:56:05 | |
 0001437749-20-003248-xbrl.zip | 354024 | 2020-02-21 12:56:05 |
| ex_172061.htm | 18943 | 2020-02-21 12:56:05 |
| ex_172062.htm | 70233 | 2020-02-21 12:56:05 |
| ex_172063.htm | 3712 | 2020-02-21 12:56:05 |
| ex_172064.htm | 14399 | 2020-02-21 12:56:05 |
| ex_172065.htm | 14933 | 2020-02-21 12:56:05 |
| ex_172066.htm | 10224 | 2020-02-21 12:56:05 |
| FilingSummary.xml | 61187 | 2020-02-21 12:56:05 |
| Financial_Report.xlsx | 109009 | 2020-02-21 12:56:05 |
 graph1.jpg | 29349 | 2020-02-21 12:56:05 |
 logo.jpg | 21862 | 2020-02-21 12:56:05 |
| MetaLinks.json | 891402 | 2020-02-21 12:56:05 |
| nhc-20191231.xsd | 95649 | 2020-02-21 12:56:05 |
| nhc-20191231_cal.xml | 106407 | 2020-02-21 12:56:05 |
| nhc-20191231_def.xml | 625140 | 2020-02-21 12:56:05 |
| nhc-20191231_lab.xml | 570477 | 2020-02-21 12:56:05 |
| nhc-20191231_pre.xml | 683527 | 2020-02-21 12:56:05 |
| nhc20191231_10k.htm | 3146264 | 2020-02-21 12:56:05 |
| nhc20191231_10k_htm.xml | 2430661 | 2020-02-21 12:56:05 |
| R1.htm | 59181 | 2020-02-21 12:56:05 |
| R10.htm | 42930 | 2020-02-21 12:56:05 |
| R11.htm | 37079 | 2020-02-21 12:56:05 |
| R12.htm | 22004 | 2020-02-21 12:56:05 |
| R13.htm | 134791 | 2020-02-21 12:56:05 |
| R14.htm | 80566 | 2020-02-21 12:56:05 |
| R15.htm | 30635 | 2020-02-21 12:56:05 |
| R16.htm | 64179 | 2020-02-21 12:56:05 |
| R17.htm | 65107 | 2020-02-21 12:56:05 |
| R18.htm | 19817 | 2020-02-21 12:56:05 |
| R19.htm | 5561 | 2020-02-21 12:56:05 |
| R2.htm | 76107 | 2020-02-21 12:56:05 |
| R20.htm | 26141 | 2020-02-21 12:56:05 |
| R21.htm | 150132 | 2020-02-21 12:56:05 |
| R22.htm | 7856 | 2020-02-21 12:56:05 |
| R23.htm | 68433 | 2020-02-21 12:56:05 |
| R24.htm | 13715 | 2020-02-21 12:56:05 |
| R25.htm | 24334 | 2020-02-21 12:56:05 |
| R26.htm | 14300 | 2020-02-21 12:56:05 |
| R27.htm | 8178 | 2020-02-21 12:56:05 |
| R28.htm | 45476 | 2020-02-21 12:56:05 |
| R29.htm | 39457 | 2020-02-21 12:56:05 |
| R3.htm | 26617 | 2020-02-21 12:56:05 |
| R30.htm | 142945 | 2020-02-21 12:56:05 |
| R31.htm | 26288 | 2020-02-21 12:56:05 |
| R32.htm | 27783 | 2020-02-21 12:56:05 |
| R33.htm | 27194 | 2020-02-21 12:56:05 |
| R34.htm | 17520 | 2020-02-21 12:56:05 |
| R35.htm | 131680 | 2020-02-21 12:56:05 |
| R36.htm | 74751 | 2020-02-21 12:56:05 |
| R37.htm | 30072 | 2020-02-21 12:56:05 |
| R38.htm | 59780 | 2020-02-21 12:56:05 |
| R39.htm | 55609 | 2020-02-21 12:56:05 |
| R4.htm | 129414 | 2020-02-21 12:56:05 |
| R40.htm | 18856 | 2020-02-21 12:56:05 |
| R41.htm | 23370 | 2020-02-21 12:56:05 |
| R42.htm | 145380 | 2020-02-21 12:56:05 |
| R43.htm | 64925 | 2020-02-21 12:56:05 |
| R44.htm | 20358 | 2020-02-21 12:56:05 |
| R45.htm | 44131 | 2020-02-21 12:56:05 |
| R46.htm | 38203 | 2020-02-21 12:56:05 |
| R47.htm | 44437 | 2020-02-21 12:56:05 |
| R48.htm | 12619 | 2020-02-21 12:56:05 |
| R49.htm | 5588 | 2020-02-21 12:56:05 |
| R5.htm | 9293 | 2020-02-21 12:56:05 |
| R50.htm | 16204 | 2020-02-21 12:56:05 |
| R51.htm | 25600 | 2020-02-21 12:56:05 |
| R52.htm | 12630 | 2020-02-21 12:56:05 |
| R53.htm | 15264 | 2020-02-21 12:56:05 |
| R54.htm | 13427 | 2020-02-21 12:56:05 |
| R55.htm | 11824 | 2020-02-21 12:56:05 |
| R56.htm | 3181 | 2020-02-21 12:56:05 |
| R57.htm | 75750 | 2020-02-21 12:56:05 |
| R58.htm | 50872 | 2020-02-21 12:56:05 |
| R59.htm | 8385 | 2020-02-21 12:56:05 |
| R6.htm | 120507 | 2020-02-21 12:56:05 |
| R60.htm | 15749 | 2020-02-21 12:56:05 |
| R61.htm | 26455 | 2020-02-21 12:56:05 |
| R62.htm | 44677 | 2020-02-21 12:56:05 |
| R63.htm | 7911 | 2020-02-21 12:56:05 |
| R64.htm | 31451 | 2020-02-21 12:56:05 |
| R65.htm | 23644 | 2020-02-21 12:56:05 |
| R66.htm | 23250 | 2020-02-21 12:56:05 |
| R67.htm | 8639 | 2020-02-21 12:56:05 |
| R68.htm | 27159 | 2020-02-21 12:56:05 |
| R69.htm | 38078 | 2020-02-21 12:56:05 |
| R7.htm | 51984 | 2020-02-21 12:56:05 |
| R70.htm | 2653 | 2020-02-21 12:56:05 |
| R71.htm | 19629 | 2020-02-21 12:56:05 |
| R72.htm | 8895 | 2020-02-21 12:56:05 |
| R73.htm | 16497 | 2020-02-21 12:56:05 |
| R74.htm | 13098 | 2020-02-21 12:56:05 |
| R75.htm | 18669 | 2020-02-21 12:56:05 |
| R76.htm | 22624 | 2020-02-21 12:56:05 |
| R77.htm | 19533 | 2020-02-21 12:56:05 |
| R78.htm | 48341 | 2020-02-21 12:56:05 |
| R79.htm | 31852 | 2020-02-21 12:56:05 |
| R8.htm | 3112 | 2020-02-21 12:56:05 |
| R80.htm | 25406 | 2020-02-21 12:56:05 |
| R81.htm | 11582 | 2020-02-21 12:56:05 |
| R82.htm | 24874 | 2020-02-21 12:56:05 |
| R83.htm | 10645 | 2020-02-21 12:56:05 |
| R84.htm | 29313 | 2020-02-21 12:56:05 |
| R85.htm | 15614 | 2020-02-21 12:56:05 |
| R86.htm | 3188 | 2020-02-21 12:56:05 |
| R87.htm | 6818 | 2020-02-21 12:56:05 |
| R88.htm | 21189 | 2020-02-21 12:56:05 |
| R89.htm | 35742 | 2020-02-21 12:56:05 |
| R9.htm | 93808 | 2020-02-21 12:56:05 |
| R90.htm | 15447 | 2020-02-21 12:56:05 |
| R91.htm | 24106 | 2020-02-21 12:56:05 |
| R92.htm | 10575 | 2020-02-21 12:56:05 |
| report.css | 2767 | 2020-02-21 12:56:05 |
| Show.js | 1085 | 2020-02-21 12:56:05 |