Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001733998-23-000005-index-headers.html | 2023-02-23 19:40:12 | |
| 0001733998-23-000005-index.html | 2023-02-23 19:40:12 | |
| 0001733998-23-000005.txt | 2023-02-23 19:40:12 | |
 0001733998-23-000005-xbrl.zip | 115563 | 2023-02-23 19:40:12 |
| a991pressreleaseq42022.htm | 281195 | 2023-02-23 19:40:12 |
| FilingSummary.xml | 1879 | 2023-02-23 19:40:12 |
| Financial_Report.xlsx | 6039 | 2023-02-23 19:40:12 |
| MetaLinks.json | 22718 | 2023-02-23 19:40:12 |
| nwn-20230224.htm | 68205 | 2023-02-23 19:40:12 |
| nwn-20230224.xsd | 2939 | 2023-02-23 19:40:12 |
| nwn-20230224_def.xml | 16431 | 2023-02-23 19:40:12 |
 nwn-20230224_g1.jpg | 57055 | 2023-02-23 19:40:12 |
 nwn-20230224_g2.jpg | 38736 | 2023-02-23 19:40:12 |
| nwn-20230224_htm.xml | 20633 | 2023-02-23 19:40:12 |
| nwn-20230224_lab.xml | 31891 | 2023-02-23 19:40:12 |
| nwn-20230224_pre.xml | 16703 | 2023-02-23 19:40:12 |
 nwnholdingshza33.jpg | 57055 | 2023-02-23 19:40:12 |
| R1.htm | 45119 | 2023-02-23 19:40:12 |
| report.css | 2767 | 2023-02-23 19:40:12 |
| Show.js | 1085 | 2023-02-23 19:40:12 |