Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000110019-23-000004-index-headers.html | 2023-02-27 08:30:15 | |
| 0000110019-23-000004-index.html | 2023-02-27 08:30:15 | |
| 0000110019-23-000004.txt | 2023-02-27 08:30:15 | |
 0000110019-23-000004-xbrl.zip | 211844 | 2023-02-27 08:30:15 |
| FilingSummary.xml | 23741 | 2023-02-27 08:30:15 |
| Financial_Report.xlsx | 73022 | 2023-02-27 08:30:15 |
| MetaLinks.json | 516156 | 2023-02-27 08:30:15 |
| nwp-20221231.htm | 1105088 | 2023-02-27 08:30:15 |
| nwp-20221231.xsd | 28953 | 2023-02-27 08:30:15 |
| nwp-20221231_cal.xml | 53426 | 2023-02-27 08:30:15 |
| nwp-20221231_def.xml | 129096 | 2023-02-27 08:30:15 |
| nwp-20221231_htm.xml | 758651 | 2023-02-27 08:30:15 |
| nwp-20221231_lab.xml | 435647 | 2023-02-27 08:30:15 |
| nwp-20221231_pre.xml | 263630 | 2023-02-27 08:30:15 |
| nwp_20221231xex-311.htm | 10272 | 2023-02-27 08:30:15 |
| nwp_20221231xex-312.htm | 10509 | 2023-02-27 08:30:15 |
| nwp_20221231xex-32.htm | 6529 | 2023-02-27 08:30:15 |
| R1.htm | 55324 | 2023-02-27 08:30:15 |
| R10.htm | 5511 | 2023-02-27 08:30:15 |
| R11.htm | 14421 | 2023-02-27 08:30:15 |
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| R14.htm | 8154 | 2023-02-27 08:30:15 |
| R15.htm | 17582 | 2023-02-27 08:30:15 |
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| R17.htm | 38059 | 2023-02-27 08:30:15 |
| R18.htm | 81106 | 2023-02-27 08:30:15 |
| R19.htm | 6568 | 2023-02-27 08:30:15 |
| R2.htm | 7784 | 2023-02-27 08:30:15 |
| R20.htm | 18515 | 2023-02-27 08:30:15 |
| R21.htm | 30023 | 2023-02-27 08:30:15 |
| R22.htm | 34913 | 2023-02-27 08:30:15 |
| R23.htm | 16937 | 2023-02-27 08:30:15 |
| R24.htm | 12630 | 2023-02-27 08:30:15 |
| R25.htm | 12566 | 2023-02-27 08:30:15 |
| R26.htm | 31017 | 2023-02-27 08:30:15 |
| R27.htm | 53923 | 2023-02-27 08:30:15 |
| R28.htm | 7669 | 2023-02-27 08:30:15 |
| R29.htm | 9543 | 2023-02-27 08:30:15 |
| R3.htm | 59316 | 2023-02-27 08:30:15 |
| R30.htm | 46593 | 2023-02-27 08:30:15 |
| R31.htm | 42916 | 2023-02-27 08:30:15 |
| R32.htm | 5311 | 2023-02-27 08:30:15 |
| R33.htm | 20593 | 2023-02-27 08:30:15 |
| R34.htm | 58941 | 2023-02-27 08:30:15 |
| R35.htm | 22404 | 2023-02-27 08:30:15 |
| R36.htm | 8433 | 2023-02-27 08:30:15 |
| R37.htm | 37149 | 2023-02-27 08:30:15 |
| R38.htm | 9905 | 2023-02-27 08:30:15 |
| R39.htm | 35779 | 2023-02-27 08:30:15 |
| R4.htm | 117155 | 2023-02-27 08:30:15 |
| R5.htm | 20757 | 2023-02-27 08:30:15 |
| R6.htm | 82225 | 2023-02-27 08:30:15 |
| R7.htm | 50568 | 2023-02-27 08:30:15 |
| R8.htm | 35421 | 2023-02-27 08:30:15 |
| R9.htm | 33173 | 2023-02-27 08:30:15 |
| report.css | 2767 | 2023-02-27 08:30:15 |
| Show.js | 1085 | 2023-02-27 08:30:15 |