Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000071829-21-000018-index-headers.html | 2021-02-26 12:38:53 | |
| 0000071829-21-000018-index.html | 2021-02-26 12:38:53 | |
| 0000071829-21-000018.txt | 2021-02-26 12:38:53 | |
 0000071829-21-000018-xbrl.zip | 608948 | 2021-02-26 12:38:53 |
| a2020q410kexhibit1075.htm | 105270 | 2021-02-26 12:38:53 |
| a2020q410kexhibit211.htm | 29603 | 2021-02-26 12:38:53 |
| a2020q410kexhibit231.htm | 2590 | 2021-02-26 12:38:53 |
| a2020q410kexhibit311.htm | 10401 | 2021-02-26 12:38:53 |
| a2020q410kexhibit312.htm | 10425 | 2021-02-26 12:38:53 |
| a2020q410kexhibit321.htm | 5177 | 2021-02-26 12:38:53 |
| a2020q410kexhibit322.htm | 4748 | 2021-02-26 12:38:53 |
| a2020q410kexhibit41.htm | 41351 | 2021-02-26 12:38:53 |
| a2020q410kexhibit951.htm | 36771 | 2021-02-26 12:38:53 |
| FilingSummary.xml | 50331 | 2021-02-26 12:38:53 |
| Financial_Report.xlsx | 131361 | 2021-02-26 12:38:53 |
| MetaLinks.json | 919795 | 2021-02-26 12:38:53 |
| nr-20201231.htm | 2540021 | 2021-02-26 12:38:53 |
| nr-20201231.xsd | 67310 | 2021-02-26 12:38:53 |
| nr-20201231_cal.xml | 165145 | 2021-02-26 12:38:53 |
| nr-20201231_def.xml | 425844 | 2021-02-26 12:38:53 |
 nr-20201231_g1.jpg | 11318 | 2021-02-26 12:38:53 |
 nr-20201231_g2.jpg | 32854 | 2021-02-26 12:38:53 |
 nr-20201231_g3.jpg | 151390 | 2021-02-26 12:38:53 |
| nr-20201231_htm.xml | 2176254 | 2021-02-26 12:38:53 |
| nr-20201231_lab.xml | 964617 | 2021-02-26 12:38:53 |
| nr-20201231_pre.xml | 649842 | 2021-02-26 12:38:53 |
| R1.htm | 70997 | 2021-02-26 12:38:53 |
| R10.htm | 5099 | 2021-02-26 12:38:53 |
| R11.htm | 15526 | 2021-02-26 12:38:53 |
| R12.htm | 23084 | 2021-02-26 12:38:53 |
| R13.htm | 67090 | 2021-02-26 12:38:53 |
| R14.htm | 46969 | 2021-02-26 12:38:53 |
| R15.htm | 31669 | 2021-02-26 12:38:53 |
| R16.htm | 87369 | 2021-02-26 12:38:53 |
| R17.htm | 109100 | 2021-02-26 12:38:53 |
| R18.htm | 20545 | 2021-02-26 12:38:53 |
| R19.htm | 28284 | 2021-02-26 12:38:53 |
| R2.htm | 85759 | 2021-02-26 12:38:53 |
| R20.htm | 50373 | 2021-02-26 12:38:53 |
| R21.htm | 133478 | 2021-02-26 12:38:53 |
| R22.htm | 19803 | 2021-02-26 12:38:53 |
| R23.htm | 13312 | 2021-02-26 12:38:53 |
| R24.htm | 93185 | 2021-02-26 12:38:53 |
| R25.htm | 21319 | 2021-02-26 12:38:53 |
| R26.htm | 15191 | 2021-02-26 12:38:53 |
| R27.htm | 21997 | 2021-02-26 12:38:53 |
| R28.htm | 67633 | 2021-02-26 12:38:53 |
| R29.htm | 28597 | 2021-02-26 12:38:53 |
| R3.htm | 10862 | 2021-02-26 12:38:53 |
| R30.htm | 27505 | 2021-02-26 12:38:53 |
| R31.htm | 64079 | 2021-02-26 12:38:53 |
| R32.htm | 107458 | 2021-02-26 12:38:53 |
| R33.htm | 13858 | 2021-02-26 12:38:53 |
| R34.htm | 28832 | 2021-02-26 12:38:53 |
| R35.htm | 38914 | 2021-02-26 12:38:53 |
| R36.htm | 134271 | 2021-02-26 12:38:53 |
| R37.htm | 21357 | 2021-02-26 12:38:53 |
| R38.htm | 26556 | 2021-02-26 12:38:53 |
| R39.htm | 25961 | 2021-02-26 12:38:53 |
| R4.htm | 63365 | 2021-02-26 12:38:53 |
| R40.htm | 17720 | 2021-02-26 12:38:53 |
| R41.htm | 7386 | 2021-02-26 12:38:53 |
| R42.htm | 17067 | 2021-02-26 12:38:53 |
| R43.htm | 5829 | 2021-02-26 12:38:53 |
| R44.htm | 29087 | 2021-02-26 12:38:53 |
| R45.htm | 9284 | 2021-02-26 12:38:53 |
| R46.htm | 20847 | 2021-02-26 12:38:53 |
| R47.htm | 14969 | 2021-02-26 12:38:53 |
| R48.htm | 24521 | 2021-02-26 12:38:53 |
| R49.htm | 27515 | 2021-02-26 12:38:53 |
| R5.htm | 21331 | 2021-02-26 12:38:53 |
| R50.htm | 31880 | 2021-02-26 12:38:53 |
| R51.htm | 192591 | 2021-02-26 12:38:53 |
| R52.htm | 17031 | 2021-02-26 12:38:53 |
| R53.htm | 16879 | 2021-02-26 12:38:53 |
| R54.htm | 12627 | 2021-02-26 12:38:53 |
| R55.htm | 18967 | 2021-02-26 12:38:53 |
| R56.htm | 26335 | 2021-02-26 12:38:53 |
| R57.htm | 57682 | 2021-02-26 12:38:53 |
| R58.htm | 12268 | 2021-02-26 12:38:53 |
| R59.htm | 40194 | 2021-02-26 12:38:53 |
| R6.htm | 5657 | 2021-02-26 12:38:53 |
| R60.htm | 29863 | 2021-02-26 12:38:53 |
| R61.htm | 12420 | 2021-02-26 12:38:53 |
| R62.htm | 35601 | 2021-02-26 12:38:53 |
| R63.htm | 48940 | 2021-02-26 12:38:53 |
| R64.htm | 16303 | 2021-02-26 12:38:53 |
| R65.htm | 14421 | 2021-02-26 12:38:53 |
| R66.htm | 51487 | 2021-02-26 12:38:53 |
| R67.htm | 36990 | 2021-02-26 12:38:53 |
| R68.htm | 10300 | 2021-02-26 12:38:53 |
| R69.htm | 117647 | 2021-02-26 12:38:53 |
| R7.htm | 54056 | 2021-02-26 12:38:53 |
| R70.htm | 49014 | 2021-02-26 12:38:53 |
| R71.htm | 31167 | 2021-02-26 12:38:53 |
| R72.htm | 30146 | 2021-02-26 12:38:53 |
| R73.htm | 44040 | 2021-02-26 12:38:53 |
| R74.htm | 31180 | 2021-02-26 12:38:53 |
| R75.htm | 27038 | 2021-02-26 12:38:53 |
| R76.htm | 20008 | 2021-02-26 12:38:53 |
| R77.htm | 22696 | 2021-02-26 12:38:53 |
| R78.htm | 7423 | 2021-02-26 12:38:53 |
| R79.htm | 11601 | 2021-02-26 12:38:53 |
| R8.htm | 89716 | 2021-02-26 12:38:53 |
| R80.htm | 7389 | 2021-02-26 12:38:53 |
| R81.htm | 52827 | 2021-02-26 12:38:53 |
| R9.htm | 50218 | 2021-02-26 12:38:53 |
| report.css | 2768 | 2021-02-26 12:38:53 |
| Show.js | 1086 | 2021-02-26 12:38:53 |