Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000784977-22-000037-index-headers.html | 2022-04-28 09:02:54 | |
| 0000784977-22-000037-index.html | 2022-04-28 09:02:54 | |
| 0000784977-22-000037.txt | 2022-04-28 09:02:54 | |
 0000784977-22-000037-xbrl.zip | 36791 | 2022-04-28 09:02:54 |
| ex99120220331pressrelease.htm | 495883 | 2022-04-28 09:02:54 |
| FilingSummary.xml | 1701 | 2022-04-28 09:02:54 |
| Financial_Report.xlsx | 5652 | 2022-04-28 09:02:54 |
 image.jpg | 18768 | 2022-04-28 09:02:54 |
| MetaLinks.json | 16766 | 2022-04-28 09:02:54 |
| por-20220428.htm | 35616 | 2022-04-28 09:02:54 |
| por-20220428.xsd | 1926 | 2022-04-28 09:02:54 |
| por-20220428_htm.xml | 10712 | 2022-04-28 09:02:54 |
| por-20220428_lab.xml | 23924 | 2022-04-28 09:02:54 |
| por-20220428_pre.xml | 12613 | 2022-04-28 09:02:54 |
| q12022earningsslidesfina.htm | 12951 | 2022-04-28 09:02:54 |
 q12022earningsslidesfina001.jpg | 133278 | 2022-04-28 09:02:54 |
 q12022earningsslidesfina002.jpg | 226362 | 2022-04-28 09:02:54 |
 q12022earningsslidesfina003.jpg | 66044 | 2022-04-28 09:02:54 |
 q12022earningsslidesfina004.jpg | 93089 | 2022-04-28 09:02:54 |
 q12022earningsslidesfina005.jpg | 101538 | 2022-04-28 09:02:54 |
 q12022earningsslidesfina006.jpg | 55457 | 2022-04-28 09:02:54 |
 q12022earningsslidesfina007.jpg | 68725 | 2022-04-28 09:02:54 |
 q12022earningsslidesfina008.jpg | 70545 | 2022-04-28 09:02:54 |
 q12022earningsslidesfina009.jpg | 115417 | 2022-04-28 09:02:54 |
| R1.htm | 38689 | 2022-04-28 09:02:54 |
| report.css | 2767 | 2022-04-28 09:02:54 |
| Show.js | 1085 | 2022-04-28 09:02:54 |