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| 0001733998-23-000063.txt | 2023-11-02 17:41:20 | |
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| FilingSummary.xml | 1852 | 2023-11-02 17:41:20 |
| Financial_Report.xlsx | 6039 | 2023-11-02 17:41:20 |
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| nwn-20231103.htm | 52500 | 2023-11-02 17:41:20 |
| nwn-20231103.xsd | 2943 | 2023-11-02 17:41:20 |
| nwn-20231103_def.xml | 16357 | 2023-11-02 17:41:20 |
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| nwn-20231103_htm.xml | 5087 | 2023-11-02 17:41:20 |
| nwn-20231103_lab.xml | 31893 | 2023-11-02 17:41:20 |
| nwn-20231103_pre.xml | 16705 | 2023-11-02 17:41:20 |
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| R1.htm | 45117 | 2023-11-02 17:41:20 |
| report.css | 2767 | 2023-11-02 17:41:20 |
| Show.js | 1085 | 2023-11-02 17:41:20 |