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| 0000320575-18-000061-index.html | 2018-10-30 08:30:15 | |
| 0000320575-18-000061.txt | 2018-10-30 08:30:15 | |
 0000320575-18-000061-xbrl.zip | 283010 | 2018-10-30 08:30:15 |
| exhibit3113q2018.htm | 11996 | 2018-10-30 08:30:15 |
| exhibit3123q2018.htm | 11853 | 2018-10-30 08:30:15 |
| exhibit3213q2018.htm | 6006 | 2018-10-30 08:30:15 |
| exhibit3223q2018.htm | 6041 | 2018-10-30 08:30:15 |
| FilingSummary.xml | 33296 | 2018-10-30 08:30:15 |
| Financial_Report.xlsx | 89861 | 2018-10-30 08:30:15 |
| form10-qxq32018.htm | 1871971 | 2018-10-30 08:30:15 |
 graph1yrpricesandrigcounts.jpg | 60232 | 2018-10-30 08:30:15 |
 graph3yrpricesandrigcounts.jpg | 70662 | 2018-10-30 08:30:15 |
| pes-20180930.xml | 3102485 | 2018-10-30 08:30:15 |
| pes-20180930.xsd | 64690 | 2018-10-30 08:30:15 |
| pes-20180930_cal.xml | 98696 | 2018-10-30 08:30:15 |
| pes-20180930_def.xml | 390135 | 2018-10-30 08:30:15 |
| pes-20180930_lab.xml | 738889 | 2018-10-30 08:30:15 |
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| report.css | 2767 | 2018-10-30 08:30:15 |
| Show.js | 1085 | 2018-10-30 08:30:15 |