Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000110019-22-000010-index-headers.html | 2022-08-01 16:26:16 | |
| 0000110019-22-000010-index.html | 2022-08-01 16:26:16 | |
| 0000110019-22-000010.txt | 2022-08-01 16:26:16 | |
 0000110019-22-000010-xbrl.zip | 112469 | 2022-08-01 16:26:16 |
| FilingSummary.xml | 13079 | 2022-08-01 16:26:16 |
| Financial_Report.xlsx | 34144 | 2022-08-01 16:26:16 |
| MetaLinks.json | 286053 | 2022-08-01 16:26:16 |
| nwp-20220630.htm | 572283 | 2022-08-01 16:26:16 |
| nwp-20220630.xsd | 17605 | 2022-08-01 16:26:16 |
| nwp-20220630_cal.xml | 46860 | 2022-08-01 16:26:16 |
| nwp-20220630_def.xml | 107492 | 2022-08-01 16:26:16 |
| nwp-20220630_htm.xml | 335575 | 2022-08-01 16:26:16 |
| nwp-20220630_lab.xml | 261920 | 2022-08-01 16:26:16 |
| nwp-20220630_pre.xml | 161571 | 2022-08-01 16:26:16 |
| nwp_20220630xex-311.htm | 10257 | 2022-08-01 16:26:16 |
| nwp_20220630xex-312.htm | 10251 | 2022-08-01 16:26:16 |
| nwp_20220630xex-32.htm | 6629 | 2022-08-01 16:26:16 |
| R1.htm | 47345 | 2022-08-01 16:26:16 |
| R10.htm | 8181 | 2022-08-01 16:26:16 |
| R11.htm | 10875 | 2022-08-01 16:26:16 |
| R12.htm | 40915 | 2022-08-01 16:26:16 |
| R13.htm | 20695 | 2022-08-01 16:26:16 |
| R14.htm | 8148 | 2022-08-01 16:26:16 |
| R15.htm | 8073 | 2022-08-01 16:26:16 |
| R16.htm | 37231 | 2022-08-01 16:26:16 |
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| R18.htm | 12367 | 2022-08-01 16:26:16 |
| R19.htm | 19952 | 2022-08-01 16:26:16 |
| R2.htm | 62270 | 2022-08-01 16:26:16 |
| R20.htm | 9515 | 2022-08-01 16:26:16 |
| R21.htm | 23898 | 2022-08-01 16:26:16 |
| R3.htm | 114719 | 2022-08-01 16:26:16 |
| R4.htm | 23048 | 2022-08-01 16:26:16 |
| R5.htm | 80135 | 2022-08-01 16:26:16 |
| R6.htm | 8678 | 2022-08-01 16:26:16 |
| R7.htm | 46207 | 2022-08-01 16:26:16 |
| R8.htm | 12632 | 2022-08-01 16:26:16 |
| R9.htm | 9955 | 2022-08-01 16:26:16 |
| report.css | 2767 | 2022-08-01 16:26:16 |
| Show.js | 1085 | 2022-08-01 16:26:16 |