Parent Directory| Name | Size | Last Modified |
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| 0001085869-22-000032-index.html | 2022-02-24 09:43:36 | |
| 0001085869-22-000032.txt | 2022-02-24 09:43:36 | |
 0001085869-22-000032-xbrl.zip | 32328 | 2022-02-24 09:43:36 |
| FilingSummary.xml | 1771 | 2022-02-24 09:43:36 |
| Financial_Report.xlsx | 5705 | 2022-02-24 09:43:36 |
| MetaLinks.json | 17605 | 2022-02-24 09:43:36 |
| prfpressrelease_q42021.htm | 247138 | 2022-02-24 09:43:36 |
| prft-20220222.htm | 38190 | 2022-02-24 09:43:36 |
| prft-20220222.xsd | 1968 | 2022-02-24 09:43:36 |
| prft-20220222_htm.xml | 11012 | 2022-02-24 09:43:36 |
| prft-20220222_lab.xml | 25154 | 2022-02-24 09:43:36 |
| prft-20220222_pre.xml | 13311 | 2022-02-24 09:43:36 |
| q42021earningsdeckfinal2.htm | 9764 | 2022-02-24 09:43:36 |
 q42021earningsdeckfinal2001.jpg | 50783 | 2022-02-24 09:43:36 |
 q42021earningsdeckfinal2002.jpg | 144012 | 2022-02-24 09:43:36 |
 q42021earningsdeckfinal2003.jpg | 136475 | 2022-02-24 09:43:36 |
 q42021earningsdeckfinal2004.jpg | 144591 | 2022-02-24 09:43:36 |
 q42021earningsdeckfinal2005.jpg | 90108 | 2022-02-24 09:43:36 |
 q42021earningsdeckfinal2006.jpg | 94664 | 2022-02-24 09:43:36 |
| R1.htm | 40139 | 2022-02-24 09:43:36 |
| report.css | 2767 | 2022-02-24 09:43:36 |
| Show.js | 1085 | 2022-02-24 09:43:36 |