Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001085869-18-000009-index-headers.html | 2018-03-01 12:45:54 | |
| 0001085869-18-000009-index.html | 2018-03-01 12:45:54 | |
| 0001085869-18-000009.txt | 2018-03-01 12:45:54 | |
 0001085869-18-000009-xbrl.zip | 189806 | 2018-03-01 12:45:54 |
| creditagreementamend1.htm | 35815 | 2018-03-01 12:45:54 |
| FilingSummary.xml | 41942 | 2018-03-01 12:45:54 |
| Financial_Report.xlsx | 87553 | 2018-03-01 12:45:54 |
| form10k.htm | 1508236 | 2018-03-01 12:45:54 |
| prft-20171231.xml | 1049469 | 2018-03-01 12:45:54 |
| prft-20171231.xsd | 55758 | 2018-03-01 12:45:54 |
| prft-20171231_cal.xml | 97184 | 2018-03-01 12:45:54 |
| prft-20171231_def.xml | 286918 | 2018-03-01 12:45:54 |
| prft-20171231_lab.xml | 856866 | 2018-03-01 12:45:54 |
| prft-20171231_pre.xml | 519418 | 2018-03-01 12:45:54 |
| prft10k2017_exhibit211.htm | 5038 | 2018-03-01 12:45:54 |
| prft10k2017_exhibit231.htm | 4233 | 2018-03-01 12:45:54 |
| prft10k2017_exhibit311.htm | 8874 | 2018-03-01 12:45:54 |
| prft10k2017_exhibit312.htm | 7934 | 2018-03-01 12:45:54 |
| prft10k2017_exhibit321.htm | 5941 | 2018-03-01 12:45:54 |
| R1.htm | 29979 | 2018-03-01 12:45:54 |
| R10.htm | 31781 | 2018-03-01 12:45:54 |
| R11.htm | 6786 | 2018-03-01 12:45:54 |
| R12.htm | 9163 | 2018-03-01 12:45:54 |
| R13.htm | 50678 | 2018-03-01 12:45:54 |
| R14.htm | 41098 | 2018-03-01 12:45:54 |
| R15.htm | 17685 | 2018-03-01 12:45:54 |
| R16.htm | 8647 | 2018-03-01 12:45:54 |
| R17.htm | 79428 | 2018-03-01 12:45:54 |
| R18.htm | 16724 | 2018-03-01 12:45:54 |
| R19.htm | 12057 | 2018-03-01 12:45:54 |
| R2.htm | 66082 | 2018-03-01 12:45:54 |
| R20.htm | 32583 | 2018-03-01 12:45:54 |
| R21.htm | 12229 | 2018-03-01 12:45:54 |
| R22.htm | 33557 | 2018-03-01 12:45:54 |
| R23.htm | 6554 | 2018-03-01 12:45:54 |
| R24.htm | 73231 | 2018-03-01 12:45:54 |
| R25.htm | 6229 | 2018-03-01 12:45:54 |
| R26.htm | 7084 | 2018-03-01 12:45:54 |
| R27.htm | 8355 | 2018-03-01 12:45:54 |
| R28.htm | 31103 | 2018-03-01 12:45:54 |
| R29.htm | 54754 | 2018-03-01 12:45:54 |
| R3.htm | 13051 | 2018-03-01 12:45:54 |
| R30.htm | 44042 | 2018-03-01 12:45:54 |
| R31.htm | 12774 | 2018-03-01 12:45:54 |
| R32.htm | 78901 | 2018-03-01 12:45:54 |
| R33.htm | 9007 | 2018-03-01 12:45:54 |
| R34.htm | 9955 | 2018-03-01 12:45:54 |
| R35.htm | 38364 | 2018-03-01 12:45:54 |
| R36.htm | 11913 | 2018-03-01 12:45:54 |
| R37.htm | 33326 | 2018-03-01 12:45:54 |
| R38.htm | 39103 | 2018-03-01 12:45:54 |
| R39.htm | 44177 | 2018-03-01 12:45:54 |
| R4.htm | 56753 | 2018-03-01 12:45:54 |
| R40.htm | 7976 | 2018-03-01 12:45:54 |
| R41.htm | 15091 | 2018-03-01 12:45:54 |
| R42.htm | 37646 | 2018-03-01 12:45:54 |
| R43.htm | 40810 | 2018-03-01 12:45:54 |
| R44.htm | 42976 | 2018-03-01 12:45:54 |
| R45.htm | 27749 | 2018-03-01 12:45:54 |
| R46.htm | 6642 | 2018-03-01 12:45:54 |
| R47.htm | 14163 | 2018-03-01 12:45:54 |
| R48.htm | 11953 | 2018-03-01 12:45:54 |
| R49.htm | 22475 | 2018-03-01 12:45:54 |
| R5.htm | 14613 | 2018-03-01 12:45:54 |
| R50.htm | 20914 | 2018-03-01 12:45:54 |
| R51.htm | 20405 | 2018-03-01 12:45:54 |
| R52.htm | 9071 | 2018-03-01 12:45:54 |
| R53.htm | 48775 | 2018-03-01 12:45:54 |
| R54.htm | 11569 | 2018-03-01 12:45:54 |
| R55.htm | 48194 | 2018-03-01 12:45:54 |
| R56.htm | 39988 | 2018-03-01 12:45:54 |
| R57.htm | 11267 | 2018-03-01 12:45:54 |
| R58.htm | 32115 | 2018-03-01 12:45:54 |
| R59.htm | 47875 | 2018-03-01 12:45:54 |
| R6.htm | 71341 | 2018-03-01 12:45:54 |
| R60.htm | 10921 | 2018-03-01 12:45:54 |
| R61.htm | 18878 | 2018-03-01 12:45:54 |
| R62.htm | 8237 | 2018-03-01 12:45:54 |
| R63.htm | 7243 | 2018-03-01 12:45:54 |
| R64.htm | 30718 | 2018-03-01 12:45:54 |
| R65.htm | 11438 | 2018-03-01 12:45:54 |
| R66.htm | 26923 | 2018-03-01 12:45:54 |
| R67.htm | 23916 | 2018-03-01 12:45:54 |
| R68.htm | 11385 | 2018-03-01 12:45:54 |
| R69.htm | 10757 | 2018-03-01 12:45:54 |
| R7.htm | 98828 | 2018-03-01 12:45:54 |
| R70.htm | 23560 | 2018-03-01 12:45:54 |
| R8.htm | 6642 | 2018-03-01 12:45:54 |
| R9.htm | 39390 | 2018-03-01 12:45:54 |
| report.css | 2767 | 2018-03-01 12:45:54 |
| Show.js | 1410 | 2018-03-01 12:45:54 |