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| 0001085869-20-000076-index.html | 2020-07-31 14:05:52 | |
| 0001085869-20-000076.txt | 2020-07-31 14:05:52 | |
 0001085869-20-000076-xbrl.zip | 371656 | 2020-07-31 14:05:52 |
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| prft-20200630.htm | 1866678 | 2020-07-31 14:05:52 |
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| prftq22020exhibit321.htm | 13491 | 2020-07-31 14:05:52 |
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| report.css | 2767 | 2020-07-31 14:05:52 |
| Show.js | 1085 | 2020-07-31 14:05:52 |