Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000071829-21-000041-index-headers.html | 2021-05-05 12:40:19 | |
| 0000071829-21-000041-index.html | 2021-05-05 12:40:19 | |
| 0000071829-21-000041.txt | 2021-05-05 12:40:19 | |
 0000071829-21-000041-xbrl.zip | 186681 | 2021-05-05 12:40:19 |
| a2021q110qexhibit311.htm | 8566 | 2021-05-05 12:40:19 |
| a2021q110qexhibit312.htm | 8547 | 2021-05-05 12:40:19 |
| a2021q110qexhibit321.htm | 5225 | 2021-05-05 12:40:19 |
| a2021q110qexhibit322.htm | 5176 | 2021-05-05 12:40:19 |
| a2021q110qexhibit951.htm | 36084 | 2021-05-05 12:40:19 |
| FilingSummary.xml | 27014 | 2021-05-05 12:40:19 |
| Financial_Report.xlsx | 56167 | 2021-05-05 12:40:19 |
| MetaLinks.json | 424506 | 2021-05-05 12:40:19 |
| nr-20210331.htm | 903087 | 2021-05-05 12:40:19 |
| nr-20210331.xsd | 31898 | 2021-05-05 12:40:19 |
| nr-20210331_cal.xml | 72601 | 2021-05-05 12:40:19 |
| nr-20210331_def.xml | 159405 | 2021-05-05 12:40:19 |
 nr-20210331_g1.jpg | 11318 | 2021-05-05 12:40:19 |
| nr-20210331_htm.xml | 628794 | 2021-05-05 12:40:19 |
| nr-20210331_lab.xml | 384459 | 2021-05-05 12:40:19 |
| nr-20210331_pre.xml | 256161 | 2021-05-05 12:40:19 |
| R1.htm | 59742 | 2021-05-05 12:40:19 |
| R10.htm | 25129 | 2021-05-05 12:40:19 |
| R11.htm | 6656 | 2021-05-05 12:40:19 |
| R12.htm | 22739 | 2021-05-05 12:40:19 |
| R13.htm | 15044 | 2021-05-05 12:40:19 |
| R14.htm | 47610 | 2021-05-05 12:40:19 |
| R15.htm | 7108 | 2021-05-05 12:40:19 |
| R16.htm | 5608 | 2021-05-05 12:40:19 |
| R17.htm | 16347 | 2021-05-05 12:40:19 |
| R18.htm | 43737 | 2021-05-05 12:40:19 |
| R19.htm | 15689 | 2021-05-05 12:40:19 |
| R2.htm | 84235 | 2021-05-05 12:40:19 |
| R20.htm | 25784 | 2021-05-05 12:40:19 |
| R21.htm | 24448 | 2021-05-05 12:40:19 |
| R22.htm | 15132 | 2021-05-05 12:40:19 |
| R23.htm | 31250 | 2021-05-05 12:40:19 |
| R24.htm | 18625 | 2021-05-05 12:40:19 |
| R25.htm | 43590 | 2021-05-05 12:40:19 |
| R26.htm | 4581 | 2021-05-05 12:40:19 |
| R27.htm | 36404 | 2021-05-05 12:40:19 |
| R28.htm | 4844 | 2021-05-05 12:40:19 |
| R29.htm | 6777 | 2021-05-05 12:40:19 |
| R3.htm | 10884 | 2021-05-05 12:40:19 |
| R30.htm | 13289 | 2021-05-05 12:40:19 |
| R31.htm | 16824 | 2021-05-05 12:40:19 |
| R32.htm | 4572 | 2021-05-05 12:40:19 |
| R33.htm | 11791 | 2021-05-05 12:40:19 |
| R34.htm | 17095 | 2021-05-05 12:40:19 |
| R35.htm | 37232 | 2021-05-05 12:40:19 |
| R36.htm | 152154 | 2021-05-05 12:40:19 |
| R37.htm | 6434 | 2021-05-05 12:40:19 |
| R38.htm | 7233 | 2021-05-05 12:40:19 |
| R39.htm | 11633 | 2021-05-05 12:40:19 |
| R4.htm | 53388 | 2021-05-05 12:40:19 |
| R40.htm | 22606 | 2021-05-05 12:40:19 |
| R41.htm | 21872 | 2021-05-05 12:40:19 |
| R42.htm | 18019 | 2021-05-05 12:40:19 |
| R43.htm | 9632 | 2021-05-05 12:40:19 |
| R5.htm | 17450 | 2021-05-05 12:40:19 |
| R6.htm | 5548 | 2021-05-05 12:40:19 |
| R7.htm | 31316 | 2021-05-05 12:40:19 |
| R8.htm | 78139 | 2021-05-05 12:40:19 |
| R9.htm | 11403 | 2021-05-05 12:40:19 |
| report.css | 2767 | 2021-05-05 12:40:19 |
| Show.js | 1085 | 2021-05-05 12:40:19 |