Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000110019-21-000013-index-headers.html | 2021-11-01 16:43:01 | |
| 0000110019-21-000013-index.html | 2021-11-01 16:43:01 | |
| 0000110019-21-000013.txt | 2021-11-01 16:43:01 | |
 0000110019-21-000013-xbrl.zip | 114640 | 2021-11-01 16:43:01 |
| FilingSummary.xml | 12486 | 2021-11-01 16:43:01 |
| Financial_Report.xlsx | 32851 | 2021-11-01 16:43:01 |
| MetaLinks.json | 285509 | 2021-11-01 16:43:01 |
| nwp-20210930.htm | 594762 | 2021-11-01 16:43:01 |
| nwp-20210930.xsd | 17992 | 2021-11-01 16:43:01 |
| nwp-20210930_cal.xml | 50593 | 2021-11-01 16:43:01 |
| nwp-20210930_def.xml | 106756 | 2021-11-01 16:43:01 |
| nwp-20210930_htm.xml | 341327 | 2021-11-01 16:43:01 |
| nwp-20210930_lab.xml | 263200 | 2021-11-01 16:43:01 |
| nwp-20210930_pre.xml | 161414 | 2021-11-01 16:43:01 |
| nwp_20210930xex-311.htm | 10258 | 2021-11-01 16:43:01 |
| nwp_20210930xex-312.htm | 10249 | 2021-11-01 16:43:01 |
| nwp_20210930xex-32.htm | 6636 | 2021-11-01 16:43:01 |
| R1.htm | 47386 | 2021-11-01 16:43:01 |
| R10.htm | 8058 | 2021-11-01 16:43:01 |
| R11.htm | 10862 | 2021-11-01 16:43:01 |
| R12.htm | 41839 | 2021-11-01 16:43:01 |
| R13.htm | 8276 | 2021-11-01 16:43:01 |
| R14.htm | 8149 | 2021-11-01 16:43:01 |
| R15.htm | 37273 | 2021-11-01 16:43:01 |
| R16.htm | 28351 | 2021-11-01 16:43:01 |
| R17.htm | 12372 | 2021-11-01 16:43:01 |
| R18.htm | 34228 | 2021-11-01 16:43:01 |
| R19.htm | 9521 | 2021-11-01 16:43:01 |
| R2.htm | 64476 | 2021-11-01 16:43:01 |
| R20.htm | 26468 | 2021-11-01 16:43:01 |
| R3.htm | 114206 | 2021-11-01 16:43:01 |
| R4.htm | 23081 | 2021-11-01 16:43:01 |
| R5.htm | 80687 | 2021-11-01 16:43:01 |
| R6.htm | 10176 | 2021-11-01 16:43:01 |
| R7.htm | 47281 | 2021-11-01 16:43:01 |
| R8.htm | 12692 | 2021-11-01 16:43:01 |
| R9.htm | 14482 | 2021-11-01 16:43:01 |
| report.css | 2767 | 2021-11-01 16:43:01 |
| Show.js | 1085 | 2021-11-01 16:43:01 |