Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000070684-15-000019-index-headers.html | 2015-05-08 14:00:31 | |
| 0000070684-15-000019-index.html | 2015-05-08 14:00:31 | |
| 0000070684-15-000019.txt | 2015-05-08 14:00:31 | |
 0000070684-15-000019-xbrl.zip | 301655 | 2015-05-08 14:00:31 |
| FilingSummary.xml | 25808 | 2015-05-08 14:00:31 |
| Financial_Report.xls | 3510858 | 2015-05-08 14:00:31 |
| Financial_Report.xlsx | 315464 | 2015-05-08 14:00:31 |
| nwli-20150331.xml | 4257864 | 2015-05-08 14:00:31 |
| nwli-20150331.xsd | 54311 | 2015-05-08 14:00:31 |
| nwli-20150331_cal.xml | 102620 | 2015-05-08 14:00:31 |
| nwli-20150331_def.xml | 382829 | 2015-05-08 14:00:31 |
| nwli-20150331_lab.xml | 871939 | 2015-05-08 14:00:31 |
| nwli-20150331_pre.xml | 491616 | 2015-05-08 14:00:31 |
| nwli2015q110q.htm | 2979108 | 2015-05-08 14:00:31 |
| nwli2015q110qex-31a.htm | 18341 | 2015-05-08 14:00:31 |
| nwli2015q110qex-31b.htm | 20115 | 2015-05-08 14:00:31 |
| nwli2015q110qex-32a.htm | 23757 | 2015-05-08 14:00:31 |
 nwllogo2013a02a01a01a01a02.jpg | 24916 | 2015-05-08 14:00:31 |
| R1.htm | 32712 | 2015-05-08 14:00:31 |
| R10.htm | 12306 | 2015-05-08 14:00:31 |
| R11.htm | 77714 | 2015-05-08 14:00:31 |
| R12.htm | 58140 | 2015-05-08 14:00:31 |
| R13.htm | 260051 | 2015-05-08 14:00:31 |
| R14.htm | 105387 | 2015-05-08 14:00:31 |
| R15.htm | 19731 | 2015-05-08 14:00:31 |
| R16.htm | 491052 | 2015-05-08 14:00:31 |
| R17.htm | 515013 | 2015-05-08 14:00:31 |
| R18.htm | 92893 | 2015-05-08 14:00:31 |
| R19.htm | 9653 | 2015-05-08 14:00:31 |
| R2.htm | 132235 | 2015-05-08 14:00:31 |
| R20.htm | 23250 | 2015-05-08 14:00:31 |
| R21.htm | 76250 | 2015-05-08 14:00:31 |
| R22.htm | 55092 | 2015-05-08 14:00:31 |
| R23.htm | 268464 | 2015-05-08 14:00:31 |
| R24.htm | 97955 | 2015-05-08 14:00:31 |
| R25.htm | 497231 | 2015-05-08 14:00:31 |
| R26.htm | 570377 | 2015-05-08 14:00:31 |
| R27.htm | 86103 | 2015-05-08 14:00:31 |
| R28.htm | 35250 | 2015-05-08 14:00:31 |
| R29.htm | 6270 | 2015-05-08 14:00:31 |
| R3.htm | 37641 | 2015-05-08 14:00:31 |
| R30.htm | 61843 | 2015-05-08 14:00:31 |
| R31.htm | 8423 | 2015-05-08 14:00:31 |
| R32.htm | 65567 | 2015-05-08 14:00:31 |
| R33.htm | 180889 | 2015-05-08 14:00:31 |
| R34.htm | 55597 | 2015-05-08 14:00:31 |
| R35.htm | 85214 | 2015-05-08 14:00:31 |
| R36.htm | 58515 | 2015-05-08 14:00:31 |
| R37.htm | 38537 | 2015-05-08 14:00:31 |
| R38.htm | 33416 | 2015-05-08 14:00:31 |
| R39.htm | 69300 | 2015-05-08 14:00:31 |
| R4.htm | 98191 | 2015-05-08 14:00:31 |
| R40.htm | 141581 | 2015-05-08 14:00:31 |
| R41.htm | 184316 | 2015-05-08 14:00:31 |
| R42.htm | 34111 | 2015-05-08 14:00:31 |
| R43.htm | 72198 | 2015-05-08 14:00:31 |
| R44.htm | 166898 | 2015-05-08 14:00:31 |
| R45.htm | 159872 | 2015-05-08 14:00:31 |
| R46.htm | 105366 | 2015-05-08 14:00:31 |
| R47.htm | 26400 | 2015-05-08 14:00:31 |
| R48.htm | 23672 | 2015-05-08 14:00:31 |
| R49.htm | 11489 | 2015-05-08 14:00:31 |
| R5.htm | 43802 | 2015-05-08 14:00:31 |
| R50.htm | 19360 | 2015-05-08 14:00:31 |
| R6.htm | 94618 | 2015-05-08 14:00:31 |
| R7.htm | 164200 | 2015-05-08 14:00:31 |
| R8.htm | 30436 | 2015-05-08 14:00:31 |
| R9.htm | 9733 | 2015-05-08 14:00:31 |
| report.css | 2740 | 2015-05-08 14:00:31 |
| Show.js | 1410 | 2015-05-08 14:00:31 |