Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000110019-23-000008-index-headers.html | 2023-05-03 16:34:15 | |
| 0000110019-23-000008-index.html | 2023-05-03 16:34:15 | |
| 0000110019-23-000008.txt | 2023-05-03 16:34:15 | |
 0000110019-23-000008-xbrl.zip | 109149 | 2023-05-03 16:34:15 |
| FilingSummary.xml | 14968 | 2023-05-03 16:34:15 |
| Financial_Report.xlsx | 34017 | 2023-05-03 16:34:15 |
| MetaLinks.json | 311985 | 2023-05-03 16:34:15 |
| nwp-20230331.htm | 499328 | 2023-05-03 16:34:15 |
| nwp-20230331.xsd | 18404 | 2023-05-03 16:34:15 |
| nwp-20230331_cal.xml | 46871 | 2023-05-03 16:34:15 |
| nwp-20230331_def.xml | 104298 | 2023-05-03 16:34:15 |
| nwp-20230331_htm.xml | 276650 | 2023-05-03 16:34:15 |
| nwp-20230331_lab.xml | 267859 | 2023-05-03 16:34:15 |
| nwp-20230331_pre.xml | 160473 | 2023-05-03 16:34:15 |
| nwp_20230331xex-311.htm | 10254 | 2023-05-03 16:34:15 |
| nwp_20230331xex-312.htm | 10248 | 2023-05-03 16:34:15 |
| nwp_20230331xex-32.htm | 6624 | 2023-05-03 16:34:15 |
| R1.htm | 46812 | 2023-05-03 16:34:15 |
| R10.htm | 9905 | 2023-05-03 16:34:15 |
| R11.htm | 8155 | 2023-05-03 16:34:15 |
| R12.htm | 9452 | 2023-05-03 16:34:15 |
| R13.htm | 32876 | 2023-05-03 16:34:15 |
| R14.htm | 7672 | 2023-05-03 16:34:15 |
| R15.htm | 7540 | 2023-05-03 16:34:15 |
| R16.htm | 33623 | 2023-05-03 16:34:15 |
| R17.htm | 28067 | 2023-05-03 16:34:15 |
| R18.htm | 7211 | 2023-05-03 16:34:15 |
| R19.htm | 20018 | 2023-05-03 16:34:15 |
| R2.htm | 58018 | 2023-05-03 16:34:15 |
| R20.htm | 19772 | 2023-05-03 16:34:15 |
| R21.htm | 9443 | 2023-05-03 16:34:15 |
| R22.htm | 17958 | 2023-05-03 16:34:15 |
| R3.htm | 116603 | 2023-05-03 16:34:15 |
| R4.htm | 20045 | 2023-05-03 16:34:15 |
| R5.htm | 77415 | 2023-05-03 16:34:15 |
| R6.htm | 6807 | 2023-05-03 16:34:15 |
| R7.htm | 38188 | 2023-05-03 16:34:15 |
| R8.htm | 6258 | 2023-05-03 16:34:15 |
| R9.htm | 15696 | 2023-05-03 16:34:15 |
| report.css | 2767 | 2023-05-03 16:34:15 |
| Show.js | 1085 | 2023-05-03 16:34:15 |