Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000073020-23-000002-index-headers.html | 2023-03-08 16:21:57 | |
| 0000073020-23-000002-index.html | 2023-03-08 16:21:57 | |
| 0000073020-23-000002.txt | 2023-03-08 16:21:57 | |
 0000073020-23-000002-xbrl.zip | 51161 | 2023-03-08 16:21:57 |
| ex5acompanymtntakedownopin.htm | 8421 | 2023-03-08 16:21:57 |
| ex5bmarchmtnoffering-nwnat.htm | 8053 | 2023-03-08 16:21:57 |
| FilingSummary.xml | 1894 | 2023-03-08 16:21:57 |
| Financial_Report.xlsx | 5711 | 2023-03-08 16:21:57 |
 image_0a.jpg | 8825 | 2023-03-08 16:21:57 |
 image_1a.jpg | 2287 | 2023-03-08 16:21:57 |
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| MetaLinks.json | 20662 | 2023-03-08 16:21:57 |
| nwn-20230308.htm | 43422 | 2023-03-08 16:21:57 |
| nwn-20230308.xsd | 2939 | 2023-03-08 16:21:57 |
| nwn-20230308_def.xml | 15030 | 2023-03-08 16:21:57 |
 nwn-20230308_g1.jpg | 38736 | 2023-03-08 16:21:57 |
| nwn-20230308_htm.xml | 12765 | 2023-03-08 16:21:57 |
| nwn-20230308_lab.xml | 29122 | 2023-03-08 16:21:57 |
| nwn-20230308_pre.xml | 15122 | 2023-03-08 16:21:57 |
| R1.htm | 36280 | 2023-03-08 16:21:57 |
| report.css | 2767 | 2023-03-08 16:21:57 |
| Show.js | 1085 | 2023-03-08 16:21:57 |