Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001733998-22-000037-index-headers.html | 2022-09-30 16:54:14 | |
| 0001733998-22-000037-index.html | 2022-09-30 16:54:14 | |
| 0001733998-22-000037.txt | 2022-09-30 16:54:14 | |
 0001733998-22-000037-xbrl.zip | 113378 | 2022-09-30 16:54:14 |
| exhibit41supplementalinden.htm | 144621 | 2022-09-30 16:54:14 |
| FilingSummary.xml | 1885 | 2022-09-30 16:54:14 |
| Financial_Report.xlsx | 6033 | 2022-09-30 16:54:14 |
| MetaLinks.json | 22072 | 2022-09-30 16:54:14 |
| nwn-20220930.htm | 61394 | 2022-09-30 16:54:14 |
| nwn-20220930.xsd | 2939 | 2022-09-30 16:54:14 |
| nwn-20220930_def.xml | 16431 | 2022-09-30 16:54:14 |
 nwn-20220930_g1.jpg | 57055 | 2022-09-30 16:54:14 |
 nwn-20220930_g2.jpg | 38736 | 2022-09-30 16:54:14 |
| nwn-20220930_htm.xml | 20629 | 2022-09-30 16:54:14 |
| nwn-20220930_lab.xml | 31891 | 2022-09-30 16:54:14 |
| nwn-20220930_pre.xml | 16703 | 2022-09-30 16:54:14 |
| R1.htm | 45116 | 2022-09-30 16:54:14 |
| report.css | 2767 | 2022-09-30 16:54:14 |
| Show.js | 1085 | 2022-09-30 16:54:14 |