Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001085869-12-000007-index-headers.html | 2012-03-01 14:59:17 | |
| 0001085869-12-000007-index.html | 2012-03-01 14:59:17 | |
| 0001085869-12-000007.txt | 2012-03-01 14:59:17 | |
 0001085869-12-000007-xbrl.zip | 74749 | 2012-03-01 14:59:17 |
| auditorconsent.htm | 7112 | 2012-03-01 14:59:17 |
| ceoandcfocertification.htm | 8697 | 2012-03-01 14:59:17 |
| ceocertification.htm | 14747 | 2012-03-01 14:59:17 |
| cfocertification.htm | 14738 | 2012-03-01 14:59:17 |
| FilingSummary.xml | 11187 | 2012-03-01 14:59:17 |
| Financial_Report.xls | 1231901 | 2012-03-01 14:59:17 |
| form10k.htm | 1863288 | 2012-03-01 14:59:17 |
| prft-20111231.xml | 1317807 | 2012-03-01 14:59:17 |
| prft-20111231.xsd | 15109 | 2012-03-01 14:59:17 |
| prft-20111231_cal.xml | 40228 | 2012-03-01 14:59:17 |
| prft-20111231_def.xml | 13426 | 2012-03-01 14:59:17 |
| prft-20111231_lab.xml | 148167 | 2012-03-01 14:59:17 |
| prft-20111231_pre.xml | 99731 | 2012-03-01 14:59:17 |
| R1.htm | 37318 | 2012-03-01 14:59:17 |
| R10.htm | 7780 | 2012-03-01 14:59:17 |
| R11.htm | 7721 | 2012-03-01 14:59:17 |
| R12.htm | 12624 | 2012-03-01 14:59:17 |
| R13.htm | 112385 | 2012-03-01 14:59:17 |
| R14.htm | 129640 | 2012-03-01 14:59:17 |
| R15.htm | 224904 | 2012-03-01 14:59:17 |
| R16.htm | 11324 | 2012-03-01 14:59:17 |
| R17.htm | 267622 | 2012-03-01 14:59:17 |
| R18.htm | 26544 | 2012-03-01 14:59:17 |
| R19.htm | 106520 | 2012-03-01 14:59:17 |
| R2.htm | 107881 | 2012-03-01 14:59:17 |
| R20.htm | 36040 | 2012-03-01 14:59:17 |
| R21.htm | 135770 | 2012-03-01 14:59:17 |
| R22.htm | 7224 | 2012-03-01 14:59:17 |
| R3.htm | 19215 | 2012-03-01 14:59:17 |
| R4.htm | 93815 | 2012-03-01 14:59:17 |
| R5.htm | 93388 | 2012-03-01 14:59:17 |
| R6.htm | 147286 | 2012-03-01 14:59:17 |
| R7.htm | 13817 | 2012-03-01 14:59:17 |
| R8.htm | 56383 | 2012-03-01 14:59:17 |
| R9.htm | 94021 | 2012-03-01 14:59:17 |
| report.css | 2721 | 2012-03-01 14:59:17 |
| Show.js | 6423 | 2012-03-01 14:59:17 |
| subsidiaries.htm | 5506 | 2012-03-01 14:59:17 |