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| 0001213900-21-014122-index.html | 2021-03-08 21:52:44 | |
| 0001213900-21-014122.txt | 2021-03-08 21:52:44 | |
 0001213900-21-014122-xbrl.zip | 80406 | 2021-03-08 21:52:44 |
| f10k2020ex31-1_northerngen.htm | 11759 | 2021-03-08 21:52:44 |
| f10k2020ex31-2_northerngen.htm | 11989 | 2021-03-08 21:52:44 |
| f10k2020ex32-1_northerngen.htm | 5809 | 2021-03-08 21:52:44 |
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| R9.htm | 25981 | 2021-03-08 21:52:44 |
| report.css | 2767 | 2021-03-08 21:52:44 |
| Show.js | 1085 | 2021-03-08 21:52:44 |