Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000070415-21-000070-index-headers.html | 2021-04-30 16:20:22 | |
| 0000070415-21-000070-index.html | 2021-04-30 16:20:22 | |
| 0000070415-21-000070.txt | 2021-04-30 16:20:22 | |
 0000070415-21-000070-xbrl.zip | 62038 | 2021-04-30 16:20:22 |
| exhibit311certificationa12.htm | 4598 | 2021-04-30 16:20:22 |
| exhibit312certificationa12.htm | 4811 | 2021-04-30 16:20:22 |
| FilingSummary.xml | 1771 | 2021-04-30 16:20:22 |
| Financial_Report.xlsx | 6624 | 2021-04-30 16:20:22 |
| gpx-20201231.htm | 673664 | 2021-04-30 16:20:22 |
| gpx-20201231.xsd | 2427 | 2021-04-30 16:20:22 |
| gpx-20201231_cal.xml | 715 | 2021-04-30 16:20:22 |
| gpx-20201231_def.xml | 1648 | 2021-04-30 16:20:22 |
| gpx-20201231_htm.xml | 18844 | 2021-04-30 16:20:22 |
| gpx-20201231_lab.xml | 36949 | 2021-04-30 16:20:22 |
| gpx-20201231_pre.xml | 19657 | 2021-04-30 16:20:22 |
| MetaLinks.json | 25967 | 2021-04-30 16:20:22 |
| R1.htm | 65303 | 2021-04-30 16:20:22 |
| report.css | 2767 | 2021-04-30 16:20:22 |
| Show.js | 1085 | 2021-04-30 16:20:22 |