Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001733998-22-000020-index-headers.html | 2022-06-01 13:10:08 | |
| 0001733998-22-000020-index.html | 2022-06-01 13:10:08 | |
| 0001733998-22-000020.txt | 2022-06-01 13:10:08 | |
 0001733998-22-000020-xbrl.zip | 96076 | 2022-06-01 13:10:08 |
| FilingSummary.xml | 1835 | 2022-06-01 13:10:08 |
| Financial_Report.xlsx | 5996 | 2022-06-01 13:10:08 |
| MetaLinks.json | 22072 | 2022-06-01 13:10:08 |
| nwn-20220531.htm | 63007 | 2022-06-01 13:10:08 |
| nwn-20220531.xsd | 2939 | 2022-06-01 13:10:08 |
| nwn-20220531_def.xml | 16431 | 2022-06-01 13:10:08 |
 nwn-20220531_g1.jpg | 57055 | 2022-06-01 13:10:08 |
 nwn-20220531_g2.jpg | 38736 | 2022-06-01 13:10:08 |
| nwn-20220531_htm.xml | 20655 | 2022-06-01 13:10:08 |
| nwn-20220531_lab.xml | 31891 | 2022-06-01 13:10:08 |
| nwn-20220531_pre.xml | 16703 | 2022-06-01 13:10:08 |
| R1.htm | 45945 | 2022-06-01 13:10:08 |
| report.css | 2767 | 2022-06-01 13:10:08 |
| Show.js | 1085 | 2022-06-01 13:10:08 |