Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000071829-19-000021-index-headers.html | 2019-02-22 13:45:01 | |
| 0000071829-19-000021-index.html | 2019-02-22 13:45:01 | |
| 0000071829-19-000021.txt | 2019-02-22 13:45:01 | |
 0000071829-19-000021-xbrl.zip | 358344 | 2019-02-22 13:45:01 |
| a2018q410k.htm | 2214648 | 2019-02-22 13:45:01 |
| a2018q4exhibit1059.htm | 50137 | 2019-02-22 13:45:01 |
| a2018q4exhibit211.htm | 29947 | 2019-02-22 13:45:01 |
| a2018q4exhibit231.htm | 3463 | 2019-02-22 13:45:01 |
| a2018q4exhibit311.htm | 12307 | 2019-02-22 13:45:01 |
| a2018q4exhibit312.htm | 12331 | 2019-02-22 13:45:01 |
| a2018q4exhibit321.htm | 5933 | 2019-02-22 13:45:01 |
| a2018q4exhibit322.htm | 5612 | 2019-02-22 13:45:01 |
| a2018q4exhibit951.htm | 57458 | 2019-02-22 13:45:01 |
 chart-9b178b5ca5ff85d5d66.jpg | 73684 | 2019-02-22 13:45:01 |
| FilingSummary.xml | 59169 | 2019-02-22 13:45:01 |
| Financial_Report.xlsx | 134245 | 2019-02-22 13:45:01 |
| nr-20181231.xml | 2681133 | 2019-02-22 13:45:01 |
| nr-20181231.xsd | 73127 | 2019-02-22 13:45:01 |
| nr-20181231_cal.xml | 145814 | 2019-02-22 13:45:01 |
| nr-20181231_def.xml | 536869 | 2019-02-22 13:45:01 |
| nr-20181231_lab.xml | 1122970 | 2019-02-22 13:45:01 |
| nr-20181231_pre.xml | 773764 | 2019-02-22 13:45:01 |
 nrimage.jpg | 11318 | 2019-02-22 13:45:01 |
| R1.htm | 35420 | 2019-02-22 13:45:01 |
| R10.htm | 24669 | 2019-02-22 13:45:01 |
| R11.htm | 18832 | 2019-02-22 13:45:01 |
| R12.htm | 31614 | 2019-02-22 13:45:01 |
| R13.htm | 99933 | 2019-02-22 13:45:01 |
| R14.htm | 71333 | 2019-02-22 13:45:01 |
| R15.htm | 40080 | 2019-02-22 13:45:01 |
| R16.htm | 173700 | 2019-02-22 13:45:01 |
| R17.htm | 28916 | 2019-02-22 13:45:01 |
| R18.htm | 43066 | 2019-02-22 13:45:01 |
| R19.htm | 117032 | 2019-02-22 13:45:01 |
| R2.htm | 70378 | 2019-02-22 13:45:01 |
| R20.htm | 176656 | 2019-02-22 13:45:01 |
| R21.htm | 36899 | 2019-02-22 13:45:01 |
| R22.htm | 11170 | 2019-02-22 13:45:01 |
| R23.htm | 27704 | 2019-02-22 13:45:01 |
| R24.htm | 88042 | 2019-02-22 13:45:01 |
| R25.htm | 104058 | 2019-02-22 13:45:01 |
| R26.htm | 30695 | 2019-02-22 13:45:01 |
| R27.htm | 20300 | 2019-02-22 13:45:01 |
| R28.htm | 18711 | 2019-02-22 13:45:01 |
| R29.htm | 30024 | 2019-02-22 13:45:01 |
| R3.htm | 10852 | 2019-02-22 13:45:01 |
| R30.htm | 101159 | 2019-02-22 13:45:01 |
| R31.htm | 40475 | 2019-02-22 13:45:01 |
| R32.htm | 33876 | 2019-02-22 13:45:01 |
| R33.htm | 162454 | 2019-02-22 13:45:01 |
| R34.htm | 18543 | 2019-02-22 13:45:01 |
| R35.htm | 44257 | 2019-02-22 13:45:01 |
| R36.htm | 130532 | 2019-02-22 13:45:01 |
| R37.htm | 171212 | 2019-02-22 13:45:01 |
| R38.htm | 35842 | 2019-02-22 13:45:01 |
| R39.htm | 11635 | 2019-02-22 13:45:01 |
| R4.htm | 73352 | 2019-02-22 13:45:01 |
| R40.htm | 12051 | 2019-02-22 13:45:01 |
| R41.htm | 87124 | 2019-02-22 13:45:01 |
| R42.htm | 39993 | 2019-02-22 13:45:01 |
| R43.htm | 25606 | 2019-02-22 13:45:01 |
| R44.htm | 20205 | 2019-02-22 13:45:01 |
| R45.htm | 33323 | 2019-02-22 13:45:01 |
| R46.htm | 43128 | 2019-02-22 13:45:01 |
| R47.htm | 23114 | 2019-02-22 13:45:01 |
| R48.htm | 31662 | 2019-02-22 13:45:01 |
| R49.htm | 11431 | 2019-02-22 13:45:01 |
| R5.htm | 11755 | 2019-02-22 13:45:01 |
| R50.htm | 16113 | 2019-02-22 13:45:01 |
| R51.htm | 27127 | 2019-02-22 13:45:01 |
| R52.htm | 19226 | 2019-02-22 13:45:01 |
| R53.htm | 27290 | 2019-02-22 13:45:01 |
| R54.htm | 34301 | 2019-02-22 13:45:01 |
| R55.htm | 162895 | 2019-02-22 13:45:01 |
| R56.htm | 25159 | 2019-02-22 13:45:01 |
| R57.htm | 16178 | 2019-02-22 13:45:01 |
| R58.htm | 9754 | 2019-02-22 13:45:01 |
| R59.htm | 58065 | 2019-02-22 13:45:01 |
| R6.htm | 5264 | 2019-02-22 13:45:01 |
| R60.htm | 27407 | 2019-02-22 13:45:01 |
| R61.htm | 11722 | 2019-02-22 13:45:01 |
| R62.htm | 10359 | 2019-02-22 13:45:01 |
| R63.htm | 42399 | 2019-02-22 13:45:01 |
| R64.htm | 51089 | 2019-02-22 13:45:01 |
| R65.htm | 16298 | 2019-02-22 13:45:01 |
| R66.htm | 14009 | 2019-02-22 13:45:01 |
| R67.htm | 48995 | 2019-02-22 13:45:01 |
| R68.htm | 33032 | 2019-02-22 13:45:01 |
| R69.htm | 17438 | 2019-02-22 13:45:01 |
| R7.htm | 34424 | 2019-02-22 13:45:01 |
| R70.htm | 129196 | 2019-02-22 13:45:01 |
| R71.htm | 50422 | 2019-02-22 13:45:01 |
| R72.htm | 12076 | 2019-02-22 13:45:01 |
| R73.htm | 6954 | 2019-02-22 13:45:01 |
| R74.htm | 10953 | 2019-02-22 13:45:01 |
| R75.htm | 12764 | 2019-02-22 13:45:01 |
| R76.htm | 11808 | 2019-02-22 13:45:01 |
| R77.htm | 26215 | 2019-02-22 13:45:01 |
| R78.htm | 31538 | 2019-02-22 13:45:01 |
| R79.htm | 60715 | 2019-02-22 13:45:01 |
| R8.htm | 93732 | 2019-02-22 13:45:01 |
| R80.htm | 52777 | 2019-02-22 13:45:01 |
| R81.htm | 15198 | 2019-02-22 13:45:01 |
| R82.htm | 44043 | 2019-02-22 13:45:01 |
| R83.htm | 21899 | 2019-02-22 13:45:01 |
| R84.htm | 31911 | 2019-02-22 13:45:01 |
| R85.htm | 11400 | 2019-02-22 13:45:01 |
| R86.htm | 7422 | 2019-02-22 13:45:01 |
| R87.htm | 11591 | 2019-02-22 13:45:01 |
| R88.htm | 15135 | 2019-02-22 13:45:01 |
| R89.htm | 29969 | 2019-02-22 13:45:01 |
| R9.htm | 59709 | 2019-02-22 13:45:01 |
| R90.htm | 10020 | 2019-02-22 13:45:01 |
| R91.htm | 79962 | 2019-02-22 13:45:01 |
| R92.htm | 19451 | 2019-02-22 13:45:01 |
| R93.htm | 39022 | 2019-02-22 13:45:01 |
| R94.htm | 8063 | 2019-02-22 13:45:01 |
| report.css | 2768 | 2019-02-22 13:45:01 |
| Show.js | 1086 | 2019-02-22 13:45:01 |