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| 0000070415-15-000026-index.html | 2015-05-05 12:01:21 | |
| 0000070415-15-000026.txt | 2015-05-05 12:01:21 | |
 0000070415-15-000026-xbrl.zip | 107409 | 2015-05-05 12:01:21 |
| exhibit101psuagreement.htm | 68008 | 2015-05-05 12:01:21 |
| exhibit102-rsuagreement.htm | 63774 | 2015-05-05 12:01:21 |
| exhibit103-cashbonusplan.htm | 49188 | 2015-05-05 12:01:21 |
| exhibit311-gpx33115.htm | 12569 | 2015-05-05 12:01:21 |
| exhibit312-gpx33115.htm | 13502 | 2015-05-05 12:01:21 |
| exhibit321-gpx33115.htm | 8779 | 2015-05-05 12:01:21 |
| FilingSummary.xml | 18159 | 2015-05-05 12:01:21 |
| Financial_Report.xls | 583544 | 2015-05-05 12:01:21 |
| Financial_Report.xlsx | 99956 | 2015-05-05 12:01:21 |
| gpx-20150331.htm | 593964 | 2015-05-05 12:01:21 |
| gpx-20150331.xml | 655387 | 2015-05-05 12:01:21 |
| gpx-20150331.xsd | 29891 | 2015-05-05 12:01:21 |
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| R9.htm | 12507 | 2015-05-05 12:01:21 |
| report.css | 2740 | 2015-05-05 12:01:21 |
| Show.js | 1410 | 2015-05-05 12:01:21 |