Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000784977-23-000070-index-headers.html | 2023-04-28 08:56:00 | |
| 0000784977-23-000070-index.html | 2023-04-28 08:56:00 | |
| 0000784977-23-000070.txt | 2023-04-28 08:56:00 | |
 0000784977-23-000070-xbrl.zip | 179038 | 2023-04-28 08:56:00 |
| ex99120230331pressrelease.htm | 437946 | 2023-04-28 08:56:00 |
| exhibit11.htm | 373829 | 2023-04-28 08:56:00 |
| exhibit12.htm | 200783 | 2023-04-28 08:56:00 |
| exhibit13.htm | 217220 | 2023-04-28 08:56:00 |
| exhibit14.htm | 198621 | 2023-04-28 08:56:00 |
| exhibit51opinion.htm | 7876 | 2023-04-28 08:56:00 |
| exhibit994.htm | 8811 | 2023-04-28 08:56:00 |
| FilingSummary.xml | 1893 | 2023-04-28 08:56:00 |
| Financial_Report.xlsx | 5681 | 2023-04-28 08:56:00 |
 imagea.jpg | 18768 | 2023-04-28 08:56:00 |
 image_0.jpg | 16100 | 2023-04-28 08:56:00 |
| MetaLinks.json | 17246 | 2023-04-28 08:56:00 |
| por-20230425.htm | 58627 | 2023-04-28 08:56:00 |
| por-20230425.xsd | 1920 | 2023-04-28 08:56:00 |
| por-20230425_htm.xml | 10710 | 2023-04-28 08:56:00 |
| por-20230425_lab.xml | 23832 | 2023-04-28 08:56:00 |
| por-20230425_pre.xml | 12521 | 2023-04-28 08:56:00 |
| q12023earningsslides_fin.htm | 19298 | 2023-04-28 08:56:00 |
 q12023earningsslides_fin001.jpg | 133256 | 2023-04-28 08:56:00 |
 q12023earningsslides_fin002.jpg | 236508 | 2023-04-28 08:56:00 |
 q12023earningsslides_fin003.jpg | 62305 | 2023-04-28 08:56:00 |
 q12023earningsslides_fin004.jpg | 127283 | 2023-04-28 08:56:00 |
 q12023earningsslides_fin005.jpg | 79804 | 2023-04-28 08:56:00 |
 q12023earningsslides_fin006.jpg | 57629 | 2023-04-28 08:56:00 |
 q12023earningsslides_fin007.jpg | 107362 | 2023-04-28 08:56:00 |
 q12023earningsslides_fin008.jpg | 80915 | 2023-04-28 08:56:00 |
 q12023earningsslides_fin009.jpg | 115114 | 2023-04-28 08:56:00 |
 q12023earningsslides_fin010.jpg | 121979 | 2023-04-28 08:56:00 |
 q12023earningsslides_fin011.jpg | 160779 | 2023-04-28 08:56:00 |
 q12023earningsslides_fin012.jpg | 86861 | 2023-04-28 08:56:00 |
| R1.htm | 38082 | 2023-04-28 08:56:00 |
| report.css | 2767 | 2023-04-28 08:56:00 |
| Show.js | 1085 | 2023-04-28 08:56:00 |