Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001733998-21-000008-index-headers.html | 2021-05-04 19:14:19 | |
| 0001733998-21-000008-index.html | 2021-05-04 19:14:19 | |
| 0001733998-21-000008.txt | 2021-05-04 19:14:19 | |
 0001733998-21-000008-xbrl.zip | 113305 | 2021-05-04 19:14:19 |
| a2021q1ex991pressreleasedo.htm | 263045 | 2021-05-04 19:14:19 |
| FilingSummary.xml | 1915 | 2021-05-04 19:14:19 |
| Financial_Report.xlsx | 6005 | 2021-05-04 19:14:19 |
| MetaLinks.json | 22874 | 2021-05-04 19:14:19 |
| nwn-20210505.htm | 67385 | 2021-05-04 19:14:19 |
| nwn-20210505.xsd | 3205 | 2021-05-04 19:14:19 |
| nwn-20210505_cal.xml | 804 | 2021-05-04 19:14:19 |
| nwn-20210505_def.xml | 16611 | 2021-05-04 19:14:19 |
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 nwn-20210505_g2.jpg | 38736 | 2021-05-04 19:14:19 |
| nwn-20210505_htm.xml | 20359 | 2021-05-04 19:14:19 |
| nwn-20210505_lab.xml | 32059 | 2021-05-04 19:14:19 |
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 nwnholdingslogohza261.jpg | 64564 | 2021-05-04 19:14:19 |
| R1.htm | 45749 | 2021-05-04 19:14:19 |
| report.css | 2767 | 2021-05-04 19:14:19 |
| Show.js | 1085 | 2021-05-04 19:14:19 |