Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001085869-13-000007-index-headers.html | 2013-03-07 12:23:47 | |
| 0001085869-13-000007-index.html | 2013-03-07 12:23:47 | |
| 0001085869-13-000007.txt | 2013-03-07 12:23:47 | |
 0001085869-13-000007-xbrl.zip | 143123 | 2013-03-07 12:23:47 |
| auditorconsent.htm | 7333 | 2013-03-07 12:23:47 |
| bylaws.htm | 230715 | 2013-03-07 12:23:47 |
| ceoandcfocertification.htm | 8603 | 2013-03-07 12:23:47 |
| ceocertification.htm | 14225 | 2013-03-07 12:23:47 |
| cfocertification.htm | 14206 | 2013-03-07 12:23:47 |
| FilingSummary.xml | 35098 | 2013-03-07 12:23:47 |
| Financial_Report.xls | 2077106 | 2013-03-07 12:23:47 |
| form10k.htm | 1759889 | 2013-03-07 12:23:47 |
| prft-20121231.xml | 2197409 | 2013-03-07 12:23:47 |
| prft-20121231.xsd | 46391 | 2013-03-07 12:23:47 |
| prft-20121231_cal.xml | 77282 | 2013-03-07 12:23:47 |
| prft-20121231_def.xml | 82480 | 2013-03-07 12:23:47 |
| prft-20121231_lab.xml | 407668 | 2013-03-07 12:23:47 |
| prft-20121231_pre.xml | 318736 | 2013-03-07 12:23:47 |
| R1.htm | 39449 | 2013-03-07 12:23:47 |
| R10.htm | 117198 | 2013-03-07 12:23:47 |
| R11.htm | 6582 | 2013-03-07 12:23:47 |
| R12.htm | 10851 | 2013-03-07 12:23:47 |
| R13.htm | 10280 | 2013-03-07 12:23:47 |
| R14.htm | 143965 | 2013-03-07 12:23:47 |
| R15.htm | 123016 | 2013-03-07 12:23:47 |
| R16.htm | 89717 | 2013-03-07 12:23:47 |
| R17.htm | 12947 | 2013-03-07 12:23:47 |
| R18.htm | 181368 | 2013-03-07 12:23:47 |
| R19.htm | 28843 | 2013-03-07 12:23:47 |
| R2.htm | 100519 | 2013-03-07 12:23:47 |
| R20.htm | 113392 | 2013-03-07 12:23:47 |
| R21.htm | 34810 | 2013-03-07 12:23:47 |
| R22.htm | 132290 | 2013-03-07 12:23:47 |
| R23.htm | 87764 | 2013-03-07 12:23:47 |
| R24.htm | 8546 | 2013-03-07 12:23:47 |
| R25.htm | 9651 | 2013-03-07 12:23:47 |
| R26.htm | 112518 | 2013-03-07 12:23:47 |
| R27.htm | 108169 | 2013-03-07 12:23:47 |
| R28.htm | 124883 | 2013-03-07 12:23:47 |
| R29.htm | 81334 | 2013-03-07 12:23:47 |
| R3.htm | 19023 | 2013-03-07 12:23:47 |
| R30.htm | 180482 | 2013-03-07 12:23:47 |
| R31.htm | 27498 | 2013-03-07 12:23:47 |
| R32.htm | 122022 | 2013-03-07 12:23:47 |
| R33.htm | 33631 | 2013-03-07 12:23:47 |
| R34.htm | 128214 | 2013-03-07 12:23:47 |
| R35.htm | 62466 | 2013-03-07 12:23:47 |
| R36.htm | 15786 | 2013-03-07 12:23:47 |
| R37.htm | 5285 | 2013-03-07 12:23:47 |
| R38.htm | 46201 | 2013-03-07 12:23:47 |
| R39.htm | 23991 | 2013-03-07 12:23:47 |
| R4.htm | 99398 | 2013-03-07 12:23:47 |
| R40.htm | 7900 | 2013-03-07 12:23:47 |
| R41.htm | 21480 | 2013-03-07 12:23:47 |
| R42.htm | 16756 | 2013-03-07 12:23:47 |
| R43.htm | 20866 | 2013-03-07 12:23:47 |
| R44.htm | 13575 | 2013-03-07 12:23:47 |
| R45.htm | 4022 | 2013-03-07 12:23:47 |
| R46.htm | 5256 | 2013-03-07 12:23:47 |
| R47.htm | 18683 | 2013-03-07 12:23:47 |
| R48.htm | 44308 | 2013-03-07 12:23:47 |
| R49.htm | 51035 | 2013-03-07 12:23:47 |
| R5.htm | 29194 | 2013-03-07 12:23:47 |
| R50.htm | 37784 | 2013-03-07 12:23:47 |
| R51.htm | 35631 | 2013-03-07 12:23:47 |
| R52.htm | 16928 | 2013-03-07 12:23:47 |
| R53.htm | 42977 | 2013-03-07 12:23:47 |
| R54.htm | 14737 | 2013-03-07 12:23:47 |
| R55.htm | 55570 | 2013-03-07 12:23:47 |
| R56.htm | 32512 | 2013-03-07 12:23:47 |
| R57.htm | 31176 | 2013-03-07 12:23:47 |
| R58.htm | 5337 | 2013-03-07 12:23:47 |
| R59.htm | 14740 | 2013-03-07 12:23:47 |
| R6.htm | 87019 | 2013-03-07 12:23:47 |
| R60.htm | 24916 | 2013-03-07 12:23:47 |
| R61.htm | 32998 | 2013-03-07 12:23:47 |
| R62.htm | 14221 | 2013-03-07 12:23:47 |
| R63.htm | 12950 | 2013-03-07 12:23:47 |
| R64.htm | 37390 | 2013-03-07 12:23:47 |
| R7.htm | 145336 | 2013-03-07 12:23:47 |
| R8.htm | 13069 | 2013-03-07 12:23:47 |
| R9.htm | 43148 | 2013-03-07 12:23:47 |
| report.css | 2721 | 2013-03-07 12:23:47 |
| Show.js | 6423 | 2013-03-07 12:23:47 |
| subsidaries.htm | 5758 | 2013-03-07 12:23:47 |