Parent Directory| Name | Size | Last Modified |
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| 0001733998-22-000045-index.html | 2022-11-07 18:17:11 | |
| 0001733998-22-000045.txt | 2022-11-07 18:17:11 | |
 0001733998-22-000045-xbrl.zip | 115658 | 2022-11-07 18:17:11 |
| a2022q3ex991pressreleasedo.htm | 324994 | 2022-11-07 18:17:11 |
| FilingSummary.xml | 1885 | 2022-11-07 18:17:11 |
| Financial_Report.xlsx | 6039 | 2022-11-07 18:17:11 |
| MetaLinks.json | 22186 | 2022-11-07 18:17:11 |
| nwn-20221108.htm | 68010 | 2022-11-07 18:17:11 |
| nwn-20221108.xsd | 2939 | 2022-11-07 18:17:11 |
| nwn-20221108_def.xml | 16431 | 2022-11-07 18:17:11 |
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 nwn-20221108_g2.jpg | 38736 | 2022-11-07 18:17:11 |
| nwn-20221108_htm.xml | 20629 | 2022-11-07 18:17:11 |
| nwn-20221108_lab.xml | 31891 | 2022-11-07 18:17:11 |
| nwn-20221108_pre.xml | 16703 | 2022-11-07 18:17:11 |
 nwnholdingslogohza26a.jpg | 64564 | 2022-11-07 18:17:11 |
| R1.htm | 45119 | 2022-11-07 18:17:11 |
| report.css | 2767 | 2022-11-07 18:17:11 |
| Show.js | 1085 | 2022-11-07 18:17:11 |