Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000110019-21-000009-index-headers.html | 2021-08-02 16:31:09 | |
| 0000110019-21-000009-index.html | 2021-08-02 16:31:09 | |
| 0000110019-21-000009.txt | 2021-08-02 16:31:09 | |
 0000110019-21-000009-xbrl.zip | 110326 | 2021-08-02 16:31:09 |
| FilingSummary.xml | 12492 | 2021-08-02 16:31:09 |
| Financial_Report.xlsx | 31312 | 2021-08-02 16:31:09 |
| MetaLinks.json | 270468 | 2021-08-02 16:31:09 |
| nwp-20210630.htm | 557534 | 2021-08-02 16:31:09 |
| nwp-20210630.xsd | 16950 | 2021-08-02 16:31:09 |
| nwp-20210630_cal.xml | 50175 | 2021-08-02 16:31:09 |
| nwp-20210630_def.xml | 103504 | 2021-08-02 16:31:09 |
| nwp-20210630_htm.xml | 328171 | 2021-08-02 16:31:09 |
| nwp-20210630_lab.xml | 257084 | 2021-08-02 16:31:09 |
| nwp-20210630_pre.xml | 156733 | 2021-08-02 16:31:09 |
| nwp_20210630xex-311.htm | 10256 | 2021-08-02 16:31:09 |
| nwp_20210630xex-312.htm | 10247 | 2021-08-02 16:31:09 |
| nwp_20210630xex-32.htm | 6627 | 2021-08-02 16:31:09 |
| R1.htm | 47425 | 2021-08-02 16:31:09 |
| R10.htm | 8050 | 2021-08-02 16:31:09 |
| R11.htm | 10901 | 2021-08-02 16:31:09 |
| R12.htm | 41804 | 2021-08-02 16:31:09 |
| R13.htm | 8276 | 2021-08-02 16:31:09 |
| R14.htm | 8500 | 2021-08-02 16:31:09 |
| R15.htm | 37273 | 2021-08-02 16:31:09 |
| R16.htm | 28351 | 2021-08-02 16:31:09 |
| R17.htm | 12482 | 2021-08-02 16:31:09 |
| R18.htm | 23245 | 2021-08-02 16:31:09 |
| R19.htm | 9579 | 2021-08-02 16:31:09 |
| R2.htm | 57484 | 2021-08-02 16:31:09 |
| R20.htm | 24531 | 2021-08-02 16:31:09 |
| R3.htm | 100507 | 2021-08-02 16:31:09 |
| R4.htm | 19278 | 2021-08-02 16:31:09 |
| R5.htm | 75859 | 2021-08-02 16:31:09 |
| R6.htm | 6877 | 2021-08-02 16:31:09 |
| R7.htm | 47244 | 2021-08-02 16:31:09 |
| R8.htm | 12544 | 2021-08-02 16:31:09 |
| R9.htm | 6080 | 2021-08-02 16:31:09 |
| report.css | 2767 | 2021-08-02 16:31:09 |
| Show.js | 1085 | 2021-08-02 16:31:09 |