Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000784977-23-000066-index-headers.html | 2023-04-27 19:01:57 | |
| 0000784977-23-000066-index.html | 2023-04-27 19:01:57 | |
| 0000784977-23-000066.txt | 2023-04-27 19:01:57 | |
 0000784977-23-000066-xbrl.zip | 285998 | 2023-04-27 19:01:57 |
| ex31110-q20230331.htm | 10870 | 2023-04-27 19:01:57 |
| ex31210-q20230331.htm | 10891 | 2023-04-27 19:01:57 |
| ex3210-q20230331.htm | 7439 | 2023-04-27 19:01:57 |
| FilingSummary.xml | 29300 | 2023-04-27 19:01:57 |
| Financial_Report.xlsx | 87963 | 2023-04-27 19:01:57 |
| MetaLinks.json | 705468 | 2023-04-27 19:01:57 |
| por-20230331.htm | 1700573 | 2023-04-27 19:01:57 |
| por-20230331.xsd | 44964 | 2023-04-27 19:01:57 |
| por-20230331_cal.xml | 88335 | 2023-04-27 19:01:57 |
| por-20230331_def.xml | 290056 | 2023-04-27 19:01:57 |
| por-20230331_htm.xml | 1405607 | 2023-04-27 19:01:57 |
| por-20230331_lab.xml | 590157 | 2023-04-27 19:01:57 |
| por-20230331_pre.xml | 374346 | 2023-04-27 19:01:57 |
| R1.htm | 51539 | 2023-04-27 19:01:57 |
| R10.htm | 72048 | 2023-04-27 19:01:57 |
| R11.htm | 12768 | 2023-04-27 19:01:57 |
| R12.htm | 70290 | 2023-04-27 19:01:57 |
| R13.htm | 28552 | 2023-04-27 19:01:57 |
| R14.htm | 5680 | 2023-04-27 19:01:57 |
| R15.htm | 21112 | 2023-04-27 19:01:57 |
| R16.htm | 38844 | 2023-04-27 19:01:57 |
| R17.htm | 22338 | 2023-04-27 19:01:57 |
| R18.htm | 100560 | 2023-04-27 19:01:57 |
| R19.htm | 151287 | 2023-04-27 19:01:57 |
| R2.htm | 88215 | 2023-04-27 19:01:57 |
| R20.htm | 70130 | 2023-04-27 19:01:57 |
| R21.htm | 10635 | 2023-04-27 19:01:57 |
| R22.htm | 65899 | 2023-04-27 19:01:57 |
| R23.htm | 17294 | 2023-04-27 19:01:57 |
| R24.htm | 9412 | 2023-04-27 19:01:57 |
| R25.htm | 31762 | 2023-04-27 19:01:57 |
| R26.htm | 11885 | 2023-04-27 19:01:57 |
| R27.htm | 10398 | 2023-04-27 19:01:57 |
| R28.htm | 11948 | 2023-04-27 19:01:57 |
| R29.htm | 52475 | 2023-04-27 19:01:57 |
| R3.htm | 123581 | 2023-04-27 19:01:57 |
| R30.htm | 17055 | 2023-04-27 19:01:57 |
| R31.htm | 19189 | 2023-04-27 19:01:57 |
| R32.htm | 43126 | 2023-04-27 19:01:57 |
| R33.htm | 55512 | 2023-04-27 19:01:57 |
| R34.htm | 21004 | 2023-04-27 19:01:57 |
| R35.htm | 11535 | 2023-04-27 19:01:57 |
| R36.htm | 15871 | 2023-04-27 19:01:57 |
| R37.htm | 32570 | 2023-04-27 19:01:57 |
| R38.htm | 8279 | 2023-04-27 19:01:57 |
| R39.htm | 8755 | 2023-04-27 19:01:57 |
| R4.htm | 17840 | 2023-04-27 19:01:57 |
| R40.htm | 22769 | 2023-04-27 19:01:57 |
| R41.htm | 20927 | 2023-04-27 19:01:57 |
| R42.htm | 9300 | 2023-04-27 19:01:57 |
| R43.htm | 7222 | 2023-04-27 19:01:57 |
| R44.htm | 61057 | 2023-04-27 19:01:57 |
| R45.htm | 18483 | 2023-04-27 19:01:57 |
| R46.htm | 19455 | 2023-04-27 19:01:57 |
| R47.htm | 6838 | 2023-04-27 19:01:57 |
| R5.htm | 103758 | 2023-04-27 19:01:57 |
| R6.htm | 9977 | 2023-04-27 19:01:57 |
| R7.htm | 32922 | 2023-04-27 19:01:57 |
| R8.htm | 107624 | 2023-04-27 19:01:57 |
| R9.htm | 166196 | 2023-04-27 19:01:57 |
| report.css | 2767 | 2023-04-27 19:01:57 |
| Show.js | 1085 | 2023-04-27 19:01:57 |