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|---|---|---|
 0001733998-20-000056-index-headers.html | 2020-11-04 19:10:30 | |
| 0001733998-20-000056-index.html | 2020-11-04 19:10:30 | |
| 0001733998-20-000056.txt | 2020-11-04 19:10:30 | |
 0001733998-20-000056-xbrl.zip | 119936 | 2020-11-04 19:10:30 |
| a2020q3ex991pressrelea.htm | 368325 | 2020-11-04 19:10:30 |
| FilingSummary.xml | 1911 | 2020-11-04 19:10:30 |
| Financial_Report.xlsx | 5782 | 2020-11-04 19:10:30 |
| MetaLinks.json | 22874 | 2020-11-04 19:10:30 |
| nwn-20201105.htm | 65949 | 2020-11-04 19:10:30 |
| nwn-20201105.xsd | 3205 | 2020-11-04 19:10:30 |
| nwn-20201105_cal.xml | 804 | 2020-11-04 19:10:30 |
| nwn-20201105_def.xml | 16611 | 2020-11-04 19:10:30 |
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 nwn-20201105_g2.jpg | 38736 | 2020-11-04 19:10:30 |
| nwn-20201105_htm.xml | 20359 | 2020-11-04 19:10:30 |
| nwn-20201105_lab.xml | 32059 | 2020-11-04 19:10:30 |
| nwn-20201105_pre.xml | 16871 | 2020-11-04 19:10:30 |
 nwnholdingslogohza261a.jpg | 64564 | 2020-11-04 19:10:30 |
| R1.htm | 45752 | 2020-11-04 19:10:30 |
| report.css | 2767 | 2020-11-04 19:10:30 |
| Show.js | 1085 | 2020-11-04 19:10:30 |