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| 0001104485-18-000065-index.html | 2018-05-07 16:24:14 | |
| 0001104485-18-000065.txt | 2018-05-07 16:24:14 | |
 0001104485-18-000065-xbrl.zip | 212154 | 2018-05-07 16:24:14 |
| exhibit1213-31x18.htm | 57233 | 2018-05-07 16:24:14 |
| exhibit311-3x31x18.htm | 17793 | 2018-05-07 16:24:14 |
| exhibit312-3x31x18.htm | 17901 | 2018-05-07 16:24:14 |
| exhibit321-3x31x18.htm | 9460 | 2018-05-07 16:24:14 |
| FilingSummary.xml | 27852 | 2018-05-07 16:24:14 |
| Financial_Report.xlsx | 83552 | 2018-05-07 16:24:14 |
| nog-20180331.xml | 1199755 | 2018-05-07 16:24:14 |
| nog-20180331.xsd | 58866 | 2018-05-07 16:24:14 |
| nog-20180331x10q.htm | 1158442 | 2018-05-07 16:24:14 |
| nog-20180331_cal.xml | 69243 | 2018-05-07 16:24:14 |
| nog-20180331_def.xml | 255549 | 2018-05-07 16:24:14 |
| nog-20180331_lab.xml | 727018 | 2018-05-07 16:24:14 |
| nog-20180331_pre.xml | 409312 | 2018-05-07 16:24:14 |
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| report.css | 2767 | 2018-05-07 16:24:14 |
| Show.js | 1410 | 2018-05-07 16:24:14 |