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 0001733998-21-000031-index-headers.html | 2021-11-04 20:42:51 | |
| 0001733998-21-000031-index.html | 2021-11-04 20:42:51 | |
| 0001733998-21-000031.txt | 2021-11-04 20:42:51 | |
 0001733998-21-000031-xbrl.zip | 115964 | 2021-11-04 20:42:51 |
| a2021q3ex991pressreleasedo.htm | 328735 | 2021-11-04 20:42:51 |
| FilingSummary.xml | 1878 | 2021-11-04 20:42:51 |
| Financial_Report.xlsx | 6006 | 2021-11-04 20:42:51 |
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| nwn-20211105.htm | 68456 | 2021-11-04 20:42:51 |
| nwn-20211105.xsd | 2951 | 2021-11-04 20:42:51 |
| nwn-20211105_def.xml | 16611 | 2021-11-04 20:42:51 |
 nwn-20211105_g1.jpg | 57055 | 2021-11-04 20:42:51 |
 nwn-20211105_g2.jpg | 38736 | 2021-11-04 20:42:51 |
| nwn-20211105_htm.xml | 20480 | 2021-11-04 20:42:51 |
| nwn-20211105_lab.xml | 32059 | 2021-11-04 20:42:51 |
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 nwnholdingslogohza26.jpg | 64564 | 2021-11-04 20:42:51 |
| R1.htm | 45752 | 2021-11-04 20:42:51 |
| report.css | 2767 | 2021-11-04 20:42:51 |
| Show.js | 1085 | 2021-11-04 20:42:51 |