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| 0001104485-17-000099-index.html | 2017-11-09 13:30:41 | |
| 0001104485-17-000099.txt | 2017-11-09 13:30:41 | |
 0001104485-17-000099-xbrl.zip | 212918 | 2017-11-09 13:30:41 |
| exhibit1219-30x17.htm | 57322 | 2017-11-09 13:30:41 |
| exhibit311-9x30x17.htm | 17625 | 2017-11-09 13:30:41 |
| exhibit321-9x30x17.htm | 7855 | 2017-11-09 13:30:41 |
| FilingSummary.xml | 28908 | 2017-11-09 13:30:41 |
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| nog-20170930.xsd | 55184 | 2017-11-09 13:30:41 |
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| report.css | 2767 | 2017-11-09 13:30:41 |
| Show.js | 1410 | 2017-11-09 13:30:41 |