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| 0000784977-18-000022-index.html | 2018-04-26 20:03:19 | |
| 0000784977-18-000022.txt | 2018-04-26 20:03:19 | |
 0000784977-18-000022-xbrl.zip | 200516 | 2018-04-26 20:03:19 |
| ex10110-q20180331.htm | 92764 | 2018-04-26 20:03:19 |
| ex31110-q20180331.htm | 15089 | 2018-04-26 20:03:19 |
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| ex3210-q20180331.htm | 13181 | 2018-04-26 20:03:19 |
| FilingSummary.xml | 31039 | 2018-04-26 20:03:19 |
| Financial_Report.xlsx | 74856 | 2018-04-26 20:03:19 |
| por-20180331.xml | 1588505 | 2018-04-26 20:03:19 |
| por-20180331.xsd | 47047 | 2018-04-26 20:03:19 |
| por-20180331_cal.xml | 95763 | 2018-04-26 20:03:19 |
| por-20180331_def.xml | 252798 | 2018-04-26 20:03:19 |
| por-20180331_lab.xml | 576457 | 2018-04-26 20:03:19 |
| por-20180331_pre.xml | 325563 | 2018-04-26 20:03:19 |
| por10-q20180331.htm | 1429817 | 2018-04-26 20:03:19 |
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| report.css | 2767 | 2018-04-26 20:03:19 |
| Show.js | 1410 | 2018-04-26 20:03:19 |