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| 0000070415-20-000079-index.html | 2020-05-11 16:44:52 | |
| 0000070415-20-000079.txt | 2020-05-11 16:44:52 | |
 0000070415-20-000079-xbrl.zip | 195858 | 2020-05-11 16:44:52 |
| exhibit311-gpx33120.htm | 12529 | 2020-05-11 16:44:52 |
| exhibit312-gpx33120.htm | 13482 | 2020-05-11 16:44:52 |
| exhibit321-gpx33120.htm | 8747 | 2020-05-11 16:44:52 |
| FilingSummary.xml | 23923 | 2020-05-11 16:44:52 |
| Financial_Report.xlsx | 50728 | 2020-05-11 16:44:52 |
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| gpx-20200331.xsd | 32845 | 2020-05-11 16:44:52 |
| gpx-20200331_cal.xml | 64522 | 2020-05-11 16:44:52 |
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| R9.htm | 8668 | 2020-05-11 16:44:52 |
| report.css | 2767 | 2020-05-11 16:44:52 |
| Show.js | 1085 | 2020-05-11 16:44:52 |