Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000110019-21-000006-index-headers.html | 2021-05-03 16:29:42 | |
| 0000110019-21-000006-index.html | 2021-05-03 16:29:42 | |
| 0000110019-21-000006.txt | 2021-05-03 16:29:42 | |
 0000110019-21-000006-xbrl.zip | 104906 | 2021-05-03 16:29:42 |
| FilingSummary.xml | 12492 | 2021-05-03 16:29:42 |
| Financial_Report.xlsx | 30415 | 2021-05-03 16:29:42 |
| MetaLinks.json | 271544 | 2021-05-03 16:29:42 |
| nwp-20210331.htm | 480064 | 2021-05-03 16:29:42 |
| nwp-20210331.xsd | 17811 | 2021-05-03 16:29:42 |
| nwp-20210331_cal.xml | 52848 | 2021-05-03 16:29:42 |
| nwp-20210331_def.xml | 87602 | 2021-05-03 16:29:42 |
| nwp-20210331_htm.xml | 269459 | 2021-05-03 16:29:42 |
| nwp-20210331_lab.xml | 258623 | 2021-05-03 16:29:42 |
| nwp-20210331_pre.xml | 158112 | 2021-05-03 16:29:42 |
| nwp_20210331xex-311.htm | 10245 | 2021-05-03 16:29:42 |
| nwp_20210331xex-312.htm | 10236 | 2021-05-03 16:29:42 |
| nwp_20210331xex-32.htm | 6627 | 2021-05-03 16:29:42 |
| R1.htm | 47424 | 2021-05-03 16:29:42 |
| R10.htm | 8104 | 2021-05-03 16:29:42 |
| R11.htm | 10198 | 2021-05-03 16:29:42 |
| R12.htm | 31628 | 2021-05-03 16:29:42 |
| R13.htm | 7793 | 2021-05-03 16:29:42 |
| R14.htm | 7687 | 2021-05-03 16:29:42 |
| R15.htm | 33902 | 2021-05-03 16:29:42 |
| R16.htm | 28578 | 2021-05-03 16:29:42 |
| R17.htm | 12482 | 2021-05-03 16:29:42 |
| R18.htm | 23245 | 2021-05-03 16:29:42 |
| R19.htm | 9579 | 2021-05-03 16:29:42 |
| R2.htm | 56046 | 2021-05-03 16:29:42 |
| R20.htm | 24476 | 2021-05-03 16:29:42 |
| R3.htm | 100771 | 2021-05-03 16:29:42 |
| R4.htm | 16288 | 2021-05-03 16:29:42 |
| R5.htm | 73940 | 2021-05-03 16:29:42 |
| R6.htm | 6877 | 2021-05-03 16:29:42 |
| R7.htm | 37072 | 2021-05-03 16:29:42 |
| R8.htm | 12832 | 2021-05-03 16:29:42 |
| R9.htm | 6082 | 2021-05-03 16:29:42 |
| report.css | 2767 | 2021-05-03 16:29:42 |
| Show.js | 1085 | 2021-05-03 16:29:42 |