Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001084991-21-000090-index-headers.html | 2021-11-12 16:38:36 | |
| 0001084991-21-000090-index.html | 2021-11-12 16:38:36 | |
| 0001084991-21-000090.txt | 2021-11-12 16:38:36 | |
 0001084991-21-000090-xbrl.zip | 25860 | 2021-11-12 16:38:36 |
| FilingSummary.xml | 1647 | 2021-11-12 16:38:36 |
| Financial_Report.xlsx | 5683 | 2021-11-12 16:38:36 |
 image1.jpg | 6502 | 2021-11-12 16:38:36 |
| MetaLinks.json | 16536 | 2021-11-12 16:38:36 |
| ngs-20211111.htm | 36257 | 2021-11-12 16:38:36 |
| ngs-20211111.xsd | 1903 | 2021-11-12 16:38:36 |
| ngs-20211111_htm.xml | 12024 | 2021-11-12 16:38:36 |
| ngs-20211111_lab.xml | 24137 | 2021-11-12 16:38:36 |
| ngs-20211111_pre.xml | 12513 | 2021-11-12 16:38:36 |
| ngsq32021earningsreleaseex.htm | 262931 | 2021-11-12 16:38:36 |
| R1.htm | 38581 | 2021-11-12 16:38:36 |
| report.css | 2767 | 2021-11-12 16:38:36 |
| Show.js | 1085 | 2021-11-12 16:38:36 |