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|---|---|---|
 0000784977-21-000026-index-headers.html | 2021-04-30 08:52:30 | |
| 0000784977-21-000026-index.html | 2021-04-30 08:52:30 | |
| 0000784977-21-000026.txt | 2021-04-30 08:52:30 | |
 0000784977-21-000026-xbrl.zip | 34612 | 2021-04-30 08:52:30 |
| ex99120210331pressrelease.htm | 397412 | 2021-04-30 08:52:30 |
| FilingSummary.xml | 1837 | 2021-04-30 08:52:30 |
| Financial_Report.xlsx | 5745 | 2021-04-30 08:52:30 |
 logoa051a.jpg | 12600 | 2021-04-30 08:52:30 |
| MetaLinks.json | 20730 | 2021-04-30 08:52:30 |
| por-20210430.htm | 38890 | 2021-04-30 08:52:30 |
| por-20210430.xsd | 2580 | 2021-04-30 08:52:30 |
| por-20210430_cal.xml | 723 | 2021-04-30 08:52:30 |
| por-20210430_def.xml | 6372 | 2021-04-30 08:52:30 |
| por-20210430_htm.xml | 13203 | 2021-04-30 08:52:30 |
| por-20210430_lab.xml | 29958 | 2021-04-30 08:52:30 |
| por-20210430_pre.xml | 16025 | 2021-04-30 08:52:30 |
| q12021earningsslides_fin.htm | 12120 | 2021-04-30 08:52:30 |
 q12021earningsslides_fin001.jpg | 110472 | 2021-04-30 08:52:30 |
 q12021earningsslides_fin002.jpg | 204658 | 2021-04-30 08:52:30 |
 q12021earningsslides_fin003.jpg | 61850 | 2021-04-30 08:52:30 |
 q12021earningsslides_fin004.jpg | 95457 | 2021-04-30 08:52:30 |
 q12021earningsslides_fin005.jpg | 50140 | 2021-04-30 08:52:30 |
 q12021earningsslides_fin006.jpg | 106703 | 2021-04-30 08:52:30 |
 q12021earningsslides_fin007.jpg | 54399 | 2021-04-30 08:52:30 |
 q12021earningsslides_fin008.jpg | 71202 | 2021-04-30 08:52:30 |
 q12021earningsslides_fin009.jpg | 125199 | 2021-04-30 08:52:30 |
 q12021earningsslides_fin010.jpg | 101531 | 2021-04-30 08:52:30 |
| R1.htm | 41955 | 2021-04-30 08:52:30 |
| report.css | 2767 | 2021-04-30 08:52:30 |
| Show.js | 1085 | 2021-04-30 08:52:30 |