Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001558370-22-008033-index-headers.html | 2022-05-10 13:23:58 | |
| 0001558370-22-008033-index.html | 2022-05-10 13:23:58 | |
| 0001558370-22-008033.txt | 2022-05-10 13:23:58 | |
 0001558370-22-008033-xbrl.zip | 399705 | 2022-05-10 13:23:58 |
| FilingSummary.xml | 39910 | 2022-05-10 13:23:58 |
| Financial_Report.xlsx | 124776 | 2022-05-10 13:23:58 |
| frst-20220331.xsd | 54553 | 2022-05-10 13:23:58 |
| frst-20220331x10q.htm | 5385830 | 2022-05-10 13:23:58 |
| frst-20220331x10q_htm.xml | 7095237 | 2022-05-10 13:23:58 |
| frst-20220331xex31d1.htm | 14058 | 2022-05-10 13:23:58 |
| frst-20220331xex31d2.htm | 12138 | 2022-05-10 13:23:58 |
| frst-20220331xex32d1.htm | 11462 | 2022-05-10 13:23:58 |
| frst-20220331_cal.xml | 94264 | 2022-05-10 13:23:58 |
| frst-20220331_def.xml | 388430 | 2022-05-10 13:23:58 |
| frst-20220331_lab.xml | 506688 | 2022-05-10 13:23:58 |
| frst-20220331_pre.xml | 565305 | 2022-05-10 13:23:58 |
| MetaLinks.json | 810908 | 2022-05-10 13:23:58 |
| R1.htm | 52353 | 2022-05-10 13:23:58 |
| R10.htm | 1637687 | 2022-05-10 13:23:58 |
| R11.htm | 273180 | 2022-05-10 13:23:58 |
| R12.htm | 38302 | 2022-05-10 13:23:58 |
| R13.htm | 6037 | 2022-05-10 13:23:58 |
| R14.htm | 13379 | 2022-05-10 13:23:58 |
| R15.htm | 95109 | 2022-05-10 13:23:58 |
| R16.htm | 22363 | 2022-05-10 13:23:58 |
| R17.htm | 64560 | 2022-05-10 13:23:58 |
| R18.htm | 5785 | 2022-05-10 13:23:58 |
| R19.htm | 28161 | 2022-05-10 13:23:58 |
| R2.htm | 123407 | 2022-05-10 13:23:58 |
| R20.htm | 462020 | 2022-05-10 13:23:58 |
| R21.htm | 1630387 | 2022-05-10 13:23:58 |
| R22.htm | 268938 | 2022-05-10 13:23:58 |
| R23.htm | 38297 | 2022-05-10 13:23:58 |
| R24.htm | 95096 | 2022-05-10 13:23:58 |
| R25.htm | 14691 | 2022-05-10 13:23:58 |
| R26.htm | 63419 | 2022-05-10 13:23:58 |
| R27.htm | 55986 | 2022-05-10 13:23:58 |
| R28.htm | 14570 | 2022-05-10 13:23:58 |
| R29.htm | 41090 | 2022-05-10 13:23:58 |
| R3.htm | 22220 | 2022-05-10 13:23:58 |
| R30.htm | 26730 | 2022-05-10 13:23:58 |
| R31.htm | 85513 | 2022-05-10 13:23:58 |
| R32.htm | 73830 | 2022-05-10 13:23:58 |
| R33.htm | 29596 | 2022-05-10 13:23:58 |
| R34.htm | 31030 | 2022-05-10 13:23:58 |
| R35.htm | 56505 | 2022-05-10 13:23:58 |
| R36.htm | 200183 | 2022-05-10 13:23:58 |
| R37.htm | 202548 | 2022-05-10 13:23:58 |
| R38.htm | 239981 | 2022-05-10 13:23:58 |
| R39.htm | 66454 | 2022-05-10 13:23:58 |
| R4.htm | 145591 | 2022-05-10 13:23:58 |
| R40.htm | 58904 | 2022-05-10 13:23:58 |
| R41.htm | 85317 | 2022-05-10 13:23:58 |
| R42.htm | 25044 | 2022-05-10 13:23:58 |
| R43.htm | 64961 | 2022-05-10 13:23:58 |
| R44.htm | 28897 | 2022-05-10 13:23:58 |
| R45.htm | 48485 | 2022-05-10 13:23:58 |
| R46.htm | 8797 | 2022-05-10 13:23:58 |
| R47.htm | 6758 | 2022-05-10 13:23:58 |
| R48.htm | 21073 | 2022-05-10 13:23:58 |
| R49.htm | 6924 | 2022-05-10 13:23:58 |
| R5.htm | 39955 | 2022-05-10 13:23:58 |
| R50.htm | 48745 | 2022-05-10 13:23:58 |
| R51.htm | 34000 | 2022-05-10 13:23:58 |
| R52.htm | 31234 | 2022-05-10 13:23:58 |
| R53.htm | 30407 | 2022-05-10 13:23:58 |
| R54.htm | 12003 | 2022-05-10 13:23:58 |
| R55.htm | 7660 | 2022-05-10 13:23:58 |
| R56.htm | 52319 | 2022-05-10 13:23:58 |
| R57.htm | 6949 | 2022-05-10 13:23:58 |
| R6.htm | 7096 | 2022-05-10 13:23:58 |
| R7.htm | 97818 | 2022-05-10 13:23:58 |
| R8.htm | 17758 | 2022-05-10 13:23:58 |
| R9.htm | 457798 | 2022-05-10 13:23:58 |
| report.css | 2767 | 2022-05-10 13:23:58 |
| Show.js | 1085 | 2022-05-10 13:23:58 |