Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001085869-21-000019-index-headers.html | 2021-02-25 09:55:46 | |
| 0001085869-21-000019-index.html | 2021-02-25 09:55:46 | |
| 0001085869-21-000019.txt | 2021-02-25 09:55:46 | |
 0001085869-21-000019-xbrl.zip | 31811 | 2021-02-25 09:55:46 |
| FilingSummary.xml | 1834 | 2021-02-25 09:55:46 |
| Financial_Report.xlsx | 5486 | 2021-02-25 09:55:46 |
| MetaLinks.json | 18351 | 2021-02-25 09:55:46 |
| prfpressrelease_q42020.htm | 245339 | 2021-02-25 09:55:46 |
| prft-20210225.htm | 36195 | 2021-02-25 09:55:46 |
| prft-20210225.xsd | 2489 | 2021-02-25 09:55:46 |
| prft-20210225_cal.xml | 775 | 2021-02-25 09:55:46 |
| prft-20210225_def.xml | 1731 | 2021-02-25 09:55:46 |
| prft-20210225_htm.xml | 10965 | 2021-02-25 09:55:46 |
| prft-20210225_lab.xml | 25298 | 2021-02-25 09:55:46 |
| prft-20210225_pre.xml | 13461 | 2021-02-25 09:55:46 |
| q42020earningsdeck.htm | 8565 | 2021-02-25 09:55:46 |
 q42020earningsdeck001.jpg | 51843 | 2021-02-25 09:55:46 |
 q42020earningsdeck002.jpg | 142347 | 2021-02-25 09:55:46 |
 q42020earningsdeck003.jpg | 112813 | 2021-02-25 09:55:46 |
 q42020earningsdeck004.jpg | 144226 | 2021-02-25 09:55:46 |
 q42020earningsdeck005.jpg | 122640 | 2021-02-25 09:55:46 |
 q42020earningsdeck006.jpg | 102823 | 2021-02-25 09:55:46 |
| R1.htm | 40176 | 2021-02-25 09:55:46 |
| report.css | 2767 | 2021-02-25 09:55:46 |
| Show.js | 1085 | 2021-02-25 09:55:46 |