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| 0000784977-20-000040-index.html | 2020-07-30 20:03:59 | |
| 0000784977-20-000040.txt | 2020-07-30 20:03:59 | |
 0000784977-20-000040-xbrl.zip | 296332 | 2020-07-30 20:03:59 |
| ex31110-q20200630.htm | 13196 | 2020-07-30 20:03:59 |
| ex31210-q20200630.htm | 13223 | 2020-07-30 20:03:59 |
| ex3210-q20200630.htm | 11879 | 2020-07-30 20:03:59 |
| FilingSummary.xml | 30155 | 2020-07-30 20:03:59 |
| Financial_Report.xlsx | 81743 | 2020-07-30 20:03:59 |
| MetaLinks.json | 549269 | 2020-07-30 20:03:59 |
| por-20200630.htm | 2575867 | 2020-07-30 20:03:59 |
| por-20200630.xsd | 44396 | 2020-07-30 20:03:59 |
| por-20200630_cal.xml | 100500 | 2020-07-30 20:03:59 |
| por-20200630_def.xml | 281336 | 2020-07-30 20:03:59 |
| por-20200630_htm.xml | 2092391 | 2020-07-30 20:03:59 |
| por-20200630_lab.xml | 555152 | 2020-07-30 20:03:59 |
| por-20200630_pre.xml | 353774 | 2020-07-30 20:03:59 |
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| report.css | 2767 | 2020-07-30 20:03:59 |
| Show.js | 1085 | 2020-07-30 20:03:59 |